[ci] Do not stale issues/prs assigned to any milestone

[nvborisenko]

User description

GitHub workflow stales the issues and PRs what we really want to address, kind of in backlog.

Motivation and Context

Now this workflow will skip the items assigned to any milestone.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement

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Description

• Updated GitHub workflow to exempt issues/PRs with milestones from being marked stale.

• Added exempt-milestones parameter to the stale.yml workflow configuration.

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Changes walkthrough 📝

	Relevant files
Configuration changes	stale.yml Update stale workflow to exempt milestone items                    .github/workflows/stale.yml Added exempt-milestones parameter to prevent staling milestone-assigned items. Ensures issues/PRs with milestones are not marked stale or closed automatically. +1/-0

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PR Reviewer Guide 🔍

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⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Ensure consistent milestone exemption rules The exempt-milestones parameter should be applied to both stale action configurations to ensure consistent behavior across all stale checks. .github/workflows/stale.yml [27-30] - uses: actions/stale@v9 with: close-issue-message: 'This issue was closed because we did not receive any additional information after 14 days.' stale-issue-label: 'R-awaiting answer' + exempt-milestones: '*' Apply this suggestion Suggestion importance[1-10]: 8 __ Why: The suggestion correctly identifies an inconsistency where milestone exemption is only applied to one stale action but not both, which could lead to inconsistent handling of milestone-assigned items. Adding the exemption to both actions ensures uniform behavior.	Medium

[VietND96]

While reading https://github.com/actions/stale, I don't see the wildcard '*' can work with that config.
I see another might help

exempt-all-milestones
If set to true, the issues or the pull requests with a milestone will not be marked as stale automatically.

Priority over exempt-milestones.

Default value: false

[VietND96]

I fixed and merged.