ci: enforce usage of scopes in PR title

[scarf005]

Purpose of change

followup of #3536, enforces much stricter PR title convention for

• better commit log
• easier changelog generation.

from now on, changelog guidelines will be strictly enforced via semantic PR bot.
it means adding invalid mod ids like fix(mods/foobar): baz to PR title is now forbidden.

Describe the solution

• blocked by build: use import map for ts imports #3674
• created scripts/semantic.ts that grabs all mainlined mod ids to autogenerate appropriate mods/<MOD_ID> scope. this allows future tool to add tag/sort/group PRs by affected mods. Currently it's meant to be ran manually since we don't add/remove mainlined mods often.
• now the autofix action also lints and tests typescript files automatically

Alternatives

maybe map scopes could be useful.

Additional Context

please mention if the script is confusing or too complex. I'm eager to improve documentation.

[Coolthulhu]

How does it work if someone wanted to add a new mod?

[scarf005]

The script could be also added on autofix.ci workflow but i think me adding the mod name in semantic.yml manually would be sufficient. that is, running deno run -A scripts/semantic.ts will update list of valid mods.