Allow excluding tests by tags in Tests Explorer

Problem description:

The current tag filtering system in Tests Explorer does not support proper exclusion when tests have multiple tags.

A test can belong to several tags (for example, core and nightly). Because of this, it is impossible to fully exclude tests that contain a specific tag.

When attempting to exclude a tag such as core, tests that also have another tag (like nightly) still appear in the results. Similarly, excluding nightly does not work if every test includes at least one additional tag.

As a result, users cannot reliably hide tests associated with certain tags, which limits the usefulness of tag-based filtering in environments where tests frequently have multiple tags.

Proposed solution:

Introduce a tag exclusion mechanism in Tests Explorer that allows users to filter out any tests containing one or more specified tags.