CI: update restyled to clang-format 18

[wirew0rm]

update restyled to use clang-format 18. Fixed on a specific image so there will be no surprise reformatting if clang-format gets it's next release.

Also disable creating pull requests and instead only push the branch and set the status check to decrease the amount of PRs especially for Draft PRs.

Since clang-format is not yet enabled here, we could also wait with merging this until we have finalized the clang-format rules.

Depends on restyled upstream clang-format support: restyled-io/restylers#735

[RalphSteinhagen]

@wirew0rm @ivan-cukic @mormj @willcode @marcusmueller We should nail down the clang-formatting rules sooner rather than later.

I initially hoped to have a community-driven, majority-voting process but this may take too much time before GrCon23 and getting this prototype as the new GR 4.0 draft in. If this is a bridge too far, we could postpone this until this repo has been migrated to the gnuradio organisation.

Maybe we could do a 2-step mini-workshop going through the clang-formatting rules?

1. agree on the overall goals and non-goals
2. going through the clang-format rule one-by-one and see which and whether some of these are enforced.

Similarly for the sonar[lint,cube] QA rules (but in another round, since the default is already quite reasonable IMO).

At least for my part, I do not want to discuss code formatting, spelling, or nit-picking things in PR reviews while losing track of the bigger picture aspects like architecture design, performance etc.

Your input/feedback on this would be much appreciated.

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[RalphSteinhagen]

@wirew0rm and @drslebedev we should move this to clang-format18 now and settled on a common format.

As discussed earlier in #311 we should:

[ ] improved clang-format definition, needs draft for further discussions and evaluation => ACTION: Semen
focus on keeping intentional line breaks/long-lines & being vertically compact otherwise

Let's keep the ball rolling and finish this so that we can release a GR 4.0 beta0 version

[wirew0rm]

Updated to clang-format-18, which has a pending PR for support in restyled restyled-io/restylers#735 which usually are merged pretty quickly.

Actual clang-format configuration is a different issue and since there is no agreed upon configuration right now this has no effects since restyled is disabled on this repository.

[sonarcloud]

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