fix(sbb-select): select shows selected value in form field instead of the label

[DavideMininni-Fincons]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the pull request tracker for a Pull Request (PR) that matches the one I want to submit, without success.

Issue

This PR Closes #1827

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

See Review Guidelines for more information what is checked during review process.

Changes

Changes in this pull request:

• the @Watch('selected') on the sbb-option has been removed to avoid infinite loops;
• the selectionChange event is triggered only in user interaction cases;
• the @Watch('value') on sbb-select now looks on values on the sbb-options to display the correct label;
• a new public @Method has been added to fetch the displayValue.

Browsers

I tested the build on the following browsers:

• Firefox Desktop
• Chrome Desktop
• Edge Desktop
• Safari Desktop
• Chrome Mobile
• Safari Mobile

Screen readers

I tested the build on the following browsers:

• JAWS Firefox Desktop
• JAWS Chrome Desktop
• NVDA Firefox Desktop
• NVDA Chrome Desktop
• VoiceOver Safari Desktop
• VoiceOver Chrome Desktop
• VoiceOver Safari Mobile
• Android Accessibility Suite Chrome Mobile

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov-commenter]

Codecov Report

Merging #1843 (44c81bb) into master (ab917b0) will decrease coverage by 17.35%.
The diff coverage is 34.51%.

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@@             Coverage Diff             @@
##           master    #1843       +/-   ##
===========================================
- Coverage   54.85%   37.50%   -17.35%     
===========================================
  Files          49      257      +208     
  Lines        1659     9807     +8148     
  Branches      406     2109     +1703     
===========================================
+ Hits          910     3678     +2768     
- Misses        671     5862     +5191     
- Partials       78      267      +189     

Impacted Files	Coverage Δ
...ts/sbb-accordion-item/sbb-accordion-item.events.ts	100.00% <ø> (ø)
.../sbb-accordion-item/sbb-accordion-item.stories.tsx	0.00% <0.00%> (ø)
...mponents/sbb-accordion-item/sbb-accordion-item.tsx	0.00% <0.00%> (-37.21%)	⬇️
...components/sbb-accordion/sbb-accordion.stories.tsx	0.00% <0.00%> (ø)
...ents/sbb-action-group/sbb-action-group.stories.tsx	0.00% <0.00%> (ø)
...onents/sbb-alert-group/sbb-alert-group.stories.tsx	0.00% <0.00%> (ø)
src/components/sbb-alert/sbb-alert.stories.tsx	0.00% <0.00%> (ø)
...onents/sbb-autocomplete/sbb-autocomplete.events.ts	100.00% <ø> (ø)
...ents/sbb-autocomplete/sbb-autocomplete.stories.tsx	0.00% <0.00%> (ø)
src/components/sbb-button/sbb-button.stories.tsx	0.00% <0.00%> (ø)
... and 58 more

... and 201 files with indirect coverage changes

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[kyubisation]

Bascially LGTM 👍
One question about event content.

[jeripeierSBB]

Nice refactoring, thanks