Fix failure of calling authenticated APIs from secondary AsgardeoProvider Instances (Multi-Provider Support)

[kavindadimuthu]

Purpose

This pull request introduces multi-HTTP clients support when multiple provider instances are implemented. This ensures that all authenticated HTTP operations are isolated per instance.

The most important changes are:

Instance-specific HTTP Client Management

• Refactored HttpClient to support multiple isolated HTTP client/axios instances, each keyed by instance ID, preventing state conflicts between auth contexts. All HTTP handler flags and callbacks are now instance-specific. [1] [2] [3] [4] [5] [6] [7] [8]
• Updated all usages of HttpClient.getInstance() to provide the correct instance ID, ensuring HTTP requests are routed through the correct context. [1] [2] [3] [4]

Related Issues

• bug: Authenticated API Calls Fail for Secondary AsgardeoProvider Instances (Multi-Provider Support) #335

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

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