[fixtures] require "skip_" prefix on skipped files

[TomasVotruba]

Based on skip- standardization of non-changing fixtures

Basic Rules

• if fixture should not be changes, does not have ---- in it, it should start with skip-
• if the fixture is changed, has-----, it cannot start with skip-

This is manual case by case work.

There was 190 cases in the start, 1/3 of the work has been done in: #5079, check there for inspiration how it should be handled

To discovery invalid cases, uncomment following from .github/workflows/code_analysis.yaml:

                    # make sure skipped files have "skip_" prefix
#                    -
#                        name: Validate Fixtures skip file prefix
#                        run: vendor/bin/easy-testing validate-fixture-skip-naming rules tests

[TomasVotruba]

Could you check this one as next? It's mostly test fixture file renaming

[samsonasik]

I will try

[samsonasik]

closing as implemented.