Add support for user-configurable Git hosts & repo lists for internal/external issue search #1110

[SehrishHussain]

This PR enhances the getInternalGitIssues API to support user configurable GitHub style hosts and dynamic repository lists defined in a config file (trssConf.json).
This allows TRSS to search issues across multiple Git providers, including GitHub Enterprise instances (e.g., github.ibm.com) and public GitHub, without requiring code changes.

The frontend (PossibleIssues.jsx) was updated accordingly to consume the new API.

Motivation

Previously, TRSS only supported a hard coded GitHub Enterprise search.
The request in issue #1109 asked for:

• User configurable repo sources
• Future support for multiple vendors
• A dedicated config file to store repos and tokens

This PR implements that.

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[SehrishHussain]

@llxia and @smlambert can you check the PR and provide your feedback.

[SehrishHussain]

I tested the enhanced getInternalGitIssues endpoint locally using:

• trssConf.json with multiple hosts.
• confirmed that results were merged across all configured repositories.
• Verified correct behavior when no config file is provided (returns a clear, user-friendly message).
• Confirmed that only repos listed in the config are queried and returned.
• Ensured unreachable hosts are skipped gracefully without breaking the overall response.
• Validated that multiple hosts return a single combined list of issues as expected.

[smlambert]

Thanks @SehrishHussain - I will set up a local server to test your build internally also (with the plan to complete the review and merge by early next week). 👍

[smlambert]

thanks @SehrishHussain and also thanks @annaibm for testing internally to verify that it works for the case captured in the possibleIssueRepos.json file that is part of this PR.