[ACS-4331] Add deleteTag method to tags API

[nikita-web-ua]

Please check if the PR fulfills these requirements

[X] The commit message follows our [guidelines](https://github.com/Alfresco/alfresco-js-api/wiki/Commit-format)
[ ] Tests for the changes have been added (for bug fixes / features)
[X] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[X] Documentation
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)

We don't currently have a method to completely remove a tag.
https://alfresco.atlassian.net/browse/ACS-4331

What is the new behavior?

deleteTag() method has been added

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[X] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[DenysVuika]

needs rebase

[DenysVuika]

@nikita-web-ua is this PR still actual?

[nikita-web-ua]

@nikita-web-ua is this PR still actual?

@DenysVuika yes it is, waiting for BE.