ci: remove merge queue workflows

[lars-reimann]

Summary of Changes

We have some checks that should be a requirement before PRs can be added to a merge queue:

• dependency review
• check title
• lint

Naturally, the code should also build. In the merge queue itself, we only need to verify again that the code still builds as previous PRs get merged in. Checking the title of the PR again, for example, is a waste of time since it cannot have changed.

However, this cannot be realized since checks that are marked as required must be run in the merge queue and on pull request events.

Conclusion: With our current throughput, a merge queue just slows us down.

See also this discussion.

[lars-reimann]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.63s

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[codecov-commenter]

Codecov Report

Merging #1280 (5aefe2b) into main (a76d2f9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1280   +/-   ##
=======================================
  Coverage   66.40%   66.40%           
=======================================
  Files         168      168           
  Lines        7188     7188           
  Branches      596      596           
=======================================
  Hits         4773     4773           
  Misses       2146     2146           
  Partials      269      269           

Components	Coverage Δ
backend	81.66% <ø> (ø)
desktop	2.65% <ø> (ø)
gui	43.03% <ø> (ø)
package-parser	75.54% <ø> (ø)