Improve ARC CE endpoint handling and token audience in IamTokenCredManager

[mightqxc]

No description provided.

[Copilot]

Pull request overview

This PR updates IamTokenCredManager to better normalize ARC CE endpoints and to adjust the requested token audience (aud) for ARC CEs when renewing IAM access tokens.

Changes:

• Strip protocol schemes from CRIC-provided CE endpoints before generating token targets/filenames.
• Persist ce_hostname for ARC CEs and use it to derive an HTTPS-style audience when renewing tokens.
• Update commit_timestamp.py.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pandaharvester/harvestercredmanager/iam_token_cred_manager.py	Normalizes CE endpoints (scheme removal), adds ARC CE hostname tracking, and adjusts token audience selection logic for ARC CE targets.
pandaharvester/commit_timestamp.py	Updates the embedded commit timestamp string.

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