add support for SHIFT binds for "Pause Unit" and "Toggle Repeat Build"

[Lightningbulb2]

Description of the proposed changes

Closes #7073

Testing done on the proposed changes

I already use this change in my mod so I know it works.

Checklist

- [ ] Changes are annotated, including comments where useful

• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6429b1d4-83ac-4ee4-9341-4ba8a0eed05f

📥 Commits

Reviewing files that changed from the base of the PR and between 827ec16 and 8790497.

📒 Files selected for processing (3)

• changelog/snippets/other.7170.md
• lua/keymap/keyactions.lua
• lua/keymap/keydescriptions.lua

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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