Add GCP secret provider support

[nisan-abeywickrama]

Purpose

This pull request adds support for Google Cloud Platform (GCP) as a secret provider in the Helm charts, alongside the existing AWS support. It introduces a new SecretProviderClass template for GCP and updates deployment templates to handle both AWS and GCP providers. The chart version is also incremented to reflect these changes.

Purpose

Secret provider enhancements:

• Added a new secret-provider-gcp.yaml template to configure GCP as a SecretProviderClass, enabling Kubernetes deployments to fetch secrets from GCP Secret Manager.
• Updated deployment templates (adapter-deployment.yaml, common-controller-deployment.yaml, gateway-runtime-deployment.yaml, ratelimiter-deployment.yaml) to support both AWS and GCP as secret providers by modifying conditional logic to check for either provider.

Chart versioning:

• Bumped the Helm chart version from 1.3.0-25 to 1.3.0-26 in Chart.yaml to reflect the new features.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.60%. Comparing base (9d952a7) to head (a42df7e).
⚠️ Report is 10 commits behind head on choreo.

Additional details and impacted files

@@          Coverage Diff           @@
##           choreo   #3308   +/-   ##
======================================
  Coverage    0.60%   0.60%           
======================================
  Files          42      42           
  Lines        4809    4809           
======================================
  Hits           29      29           
  Misses       4780    4780           

Flag	Coverage Δ
common-controller	0.60% <ø> (ø)

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