Add REST endpoint for tag deletion

[nscuro]

Description

Adds REST endpoint for tag deletion.

Addressed Issue

Relates to https://github.com/DependencyTrack/dependency-track/issues/586

Additional Details

Frontend PR: https://github.com/DependencyTrack/frontend/pull/928

Checklist

• [x] I have read and understand the contributing guidelines
• ~This PR fixes a defect, and I have provided tests to verify that the fix is effective~
• [x] This PR implements an enhancement, and I have provided tests to verify that it works as intended
• ~This PR introduces changes to the database model, and I have added corresponding update logic~
• ~This PR introduces new or alters existing behavior, and I have updated the documentation accordingly~

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.06% (target: -1.00%)	:white_check_mark: 88.03% (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (a2b2a665c9a1a47b5601ad930d4b6a0ec8cf5bf9) | 21963 | 16714 | 76.10% | | | Head commit (d8ac537dde178332dcbc5f63ccb535116d7bd23b) | 22074 (+111) | 16811 (+97) | 76.16% (**+0.06%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3896) | 117 | 103 | **88.03%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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