fix: Do not show selected tags in picker suggestions when no input is provided #1985

[marek-mihok]

The PR fulfills these requirements: (check all the apply)

• It's submitted to the main branch.
• When resolving a specific issue, it's referenced in the PR's title (e.g. feat: Add a button #xxx, where "xxx" is the issue number).
• When resolving a specific issue, the PR description includes Closes #xxx, where "xxx" is the issue number.
• If changes were made to ui folder, unit tests (make test) still pass.
• New/updated tests are included

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The problem was the implementation of onEmptyResolveSuggestions callback. As Fluent API description says, it is

A callback for what should happen when suggestions are shown without input provided. Returns the already selected items so the resolver can filter them out.

In our case it was returning initial tags (() => tags) instead of filtered ones.

Screen.Recording.2023-11-16.at.18.24.52.mov

Closes #1985

[mturoci]

Thanks @marek-mihok! The PR looks good. The test could be more strict.