Sync "mypy_primer_comment" action with "typeshed"

[sobolevn]

Right now typeshed and mypy have different techniques to hide old comments:

• typeshed: https://github.com/python/typeshed/blob/62e33cbbd53e55334f5da8870f8f4b3ae8679ac2/.github/workflows/mypy_primer_comment.yml#L70-L76
• mypy:

  mypy/.github/workflows/mypy_primer_comment.yml

  Lines 45 to 75 in 48dc990

  	# Based on https://github.com/kanga333/comment-hider
  	- name: Hide old comments
  	uses: actions/github-script@v3
  	with:
  	github-token: ${{secrets.GITHUB_TOKEN}}
  	script: |
  	const fs = require('fs')
  	const response = await github.issues.listComments({
  	issue_number: fs.readFileSync("pr_number.txt", { encoding: "utf8" }),
  	owner: context.repo.owner,
  	repo: context.repo.repo,
  	})
  	const botCommentIds = response.data
  	.filter(comment => comment.user.login === 'github-actions[bot]')
  	.map(comment => comment.node_id)
  	for (const id of botCommentIds) {
  	const resp = await github.graphql(`
  	mutation {
  	minimizeComment(input: {classifier: OUTDATED, subjectId: "${id}"}) {
  	minimizedComment {
  	isMinimized
  	}
  	}
  	}
  	`)
  	if (resp.errors) {
  	throw new Error(resp.errors)
  	}
  	}

I need to research whether these two are identical.
Maybe we can simplify mypy's action to be the same as typeshed's one.

Origin: #12125