Add Azure secret provider support

[nisan-abeywickrama]

Purpose

This pull request introduces support for Azure Key Vault as a secret provider in addition to HashiCorp Vault, and refines how secret providers are configured and deployed with the Helm charts. The changes make the secret management setup more flexible and allow users to choose between Azure and Vault providers via configuration.

Approach

Secret Provider Support Enhancements:

• Added a new template file secret-provider-azure.yaml for configuring Azure Key Vault as a secret provider, including all necessary secret mappings and parameters.
• Updated logic in the Vault secret provider template (secret-provider-vault.yaml, formerly secret-provider-class.yaml) to conditionally render only when Vault is selected as the provider. [1] [2]

Configuration Improvements:

• Added a .Values.wso2.apk.secretProviderClass.provider field to values.yaml to allow selection between "vault" and "azure" providers, and set the default to "vault".
• Enabled the secret provider class by default in values.yaml to ensure secrets are provisioned automatically.
• Extended the configuration options under the Vault section in values.yaml to include Azure-specific fields (keyVaultName, azureTenantID) for easier switching and management.

Related Issue

https://github.com/wso2-enterprise/apim-saas/issues/1093

[renuka-fernando]

Let's update the chart version as well.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.26%. Comparing base (58f9cec) to head (0f7c3b9).
⚠️ Report is 235 commits behind head on choreo.

Additional details and impacted files

@@             Coverage Diff             @@
##           choreo    #3286       +/-   ##
===========================================
+ Coverage   16.82%   80.26%   +63.43%     
===========================================
  Files         231        6      -225     
  Lines       39130      527    -38603     
  Branches        0      107      +107     
===========================================
- Hits         6584      423     -6161     
+ Misses      32109      104    -32005     
+ Partials      437        0      -437     

Flag	Coverage Δ
adapter	?
common-controller	?
idp-domain-service	80.26% <ø> (?)

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