Update Helm release base to v1.26.1
This MR contains the following updates:
| Package | Update | Change | 
|---|---|---|
| base | minor | 
1.25.3 -> 1.26.1
 | 
Complete MR checklist
Assignee
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Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md  - 
Update Docs with new/updated steps as needed  - 
Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines - 
Clean install 1.26.1  - 
Upgrade from 1.25.2 to 1.26.1  - 
1.26.1 install with local Keyclaok  - 
BB Pipeline test  - Migration Testing
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Migrate from Operator 1.23.6 to 1.26.1 O-L  - 
Rollback test from 1.26.1 O-L to 1.23.6 Operator  
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Add supporting info below
Upgrade from 1.25.2 to 1.26.1 in k3d dev cluster
% helm history -n bigbang istiod && helm history -n bigbang istio-crds && helm history -n bigbang public-ingressgateway
REVISION	UPDATED                 	STATUS    	CHART             	APP VERSION	DESCRIPTION     
1       	Wed Jun 11 21:14:02 2025	superseded	istiod-1.25.2-bb.4	1.25.2     	Install complete
2       	Wed Jun 11 21:16:07 2025	deployed  	istiod-1.26.1-bb.0	1.26.1     	Upgrade complete
REVISION	UPDATED                 	STATUS    	CHART                 	APP VERSION	DESCRIPTION     
1       	Wed Jun 11 21:13:36 2025	superseded	istio-crds-1.25.2-bb.0	1.25.2     	Install complete
2       	Wed Jun 11 21:15:47 2025	deployed  	istio-crds-1.26.1-bb.0	1.26.1     	Upgrade complete
REVISION	UPDATED                 	STATUS  	CHART                    	APP VERSION	DESCRIPTION     
1       	Wed Jun 11 21:14:32 2025	deployed	gateway-1.25.2-bb.1	1.25.2     	Install complete
2       	Wed Jun 11 21:16:19 2025	deployed	istio-gateway-1.26.1-bb.0	1.26.1     	Upgrade complete
Bigbang with local keycloak running Istio O-L 1.26.1
Migration from Istio Operator 1.23.6 to Istio Operator-less 1.26.1
%  kubectl get helmrelease -n bigbang | grep "istio\|gateway" 
istio              32m   True    Helm install succeeded for release istio-system/istio-system-istio.v1 with chart istio@1.23.6-bb.1
istio-operator     32m   True    Helm install succeeded for release istio-operator/istio-operator-istio-operator.v1 with chart istio-operator@1.23.6-bb.0
%  kubectl get helmrelease -n bigbang | grep "istio\|gateway" 
istio-crds         6m33s   True    Helm install succeeded for release istio-system/istio-crds.v1 with chart istio-crds@1.26.1-bb.0
istio-operator     41m     True    Helm install succeeded for release istio-operator/istio-operator-istio-operator.v1 with chart istio-operator@1.23.6-bb.0
istiod             6m33s   True    Helm install succeeded for release istio-system/istiod.v1 with chart istiod@1.26.1-bb.0
%  kubectl get helmrelease -n bigbang | grep "istio\|gateway" 
istio-crds                   11m    True    Helm install succeeded for release istio-system/istio-crds.v1 with chart istio-crds@1.26.1-bb.0
istiod                       11m    True    Helm install succeeded for release istio-system/istiod.v1 with chart istiod@1.26.1-bb.0
passthrough-ingressgateway   4m6s   True    Helm install succeeded for release istio-gateway/passthrough-ingressgateway.v1 with chart istio-gateway@1.26.1-bb.0
public-ingressgateway        4m6s   True    Helm install succeeded for release istio-gateway/public-ingressgateway.v1 with chart istio-gateway@1.26.1-bb.0
Rollback from Istio Operator-less 1.26.1 to Istio Operator 1.23.6
istio-crds                   51m   True    Helm install succeeded for release istio-system/istio-crds.v1 with chart istio-crds@1.26.1-bb.0
istiod                       51m   True    Helm install succeeded for release istio-system/istiod.v1 with chart istiod@1.26.1-bb.0
passthrough-ingressgateway   43m   True    Helm install succeeded for release istio-gateway/passthrough-ingressgateway.v1 with chart istio-gateway@1.26.1-bb.0
public-ingressgateway        43m   True    Helm install succeeded for release istio-gateway/public-ingressgateway.v1 with chart istio-gateway@1.26.1-bb.0
%  kubectl get helmrelease -n bigbang | grep "istio\|gateway" 
istio-crds         62m     True    Helm install succeeded for release istio-system/istio-crds.v1 with chart istio-crds@1.26.1-bb.0
istio-operator     9m42s   True    Helm install succeeded for release istio-operator/istio-operator-istio-operator.v1 with chart istio-operator@1.23.6-bb.0
istiod             62m     True    Helm install succeeded for release istio-system/istiod.v1 with chart istiod@1.26.1-bb.0
%  kubectl get helmrelease -n bigbang | grep "istio\|gateway" 
istio              60m    True    Helm install succeeded for release istio-system/istio-system-istio.v1 with chart istio@1.23.6-bb.1
istio-operator     71m    True    Helm install succeeded for release istio-operator/istio-operator-istio-operator.v1 with chart istio-operator@1.23.6-bb.0
Reviewer only
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Tested and Validated changes  
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Upgrade Notices
N/A
Edited  by Luis Gomez
