tests: Fix more tests failing on CI (#14159)

* tests: Relax color management requirements in the colors test

This continues the work from d4dd299 (#14142):
- Fixes a missed check assuming a fixed value for `colorManagementPreset`
- Stricten checks to require that the expected keywords are present as json keys

* tests: Refactor `Tests::getAttribute` (was `Tests::getWindowAttribute`)

- Improve ergonomics by consistently handling attribute name;
- Remove 'window' from the function name, since it is compatible with
  other responses too;
- Document the function.

* tests: Fix solitary test assuming it knows the complete set of blockers

The test was failing on the CI because new blockers appeared,
which were not expected by the text. Fix the test, so that it
just checks the set of expected blockers is a subset of actual
blockers

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