tools: Update list-repo-maintenance-commits

[anomiex]

Proposed changes:

• Collect the stub updates separately, don't include them in the Renovate list.
• Ignore .phan/stubs/ and tools/stubs/*-defs.php when looking for PRs touching stuff outside of projects. Probably it's not really maintenance, just someone needing a new stub.
• Allow for passing a date range into the script.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Run the script, see how it works.

[github-actions]

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[zinigor]

The mechanism that switches the repo to trunk caught me, I thought the dates weren't working properly :) Good to go, looking good!

[tbradsha]

Noting that technically this matches "dates" like 1924-90-90. I'd probably use date to validate things.