Relax lowercase requirement for `/api/v1/tag/{name}/project` and `/api/v1/tag/{name}/policy`

[nscuro]

Description

Relaxes the lowercase requirement for /api/v1/tag/{name}/project and /api/v1/tag/{name}/policy.

Users may still have mixed-case tags in their system.

Addressed Issue

Relates to #586

Additional Details

N/A

Checklist

• [x] I have read and understand the contributing guidelines
• [x] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• ~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: +0.00% (target: -1.00%)	:white_check_mark: ∅ (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (7ef047081d78f7f54c7d4ae541a38487c5c1586c) | 21905 | 16651 | 76.01% | | | Head commit (5fbf0d9c5e4f222f06bc493a4481a4f5be400ed2) | 21901 (-4) | 16648 (-3) | 76.01% (**+0.00%**) | **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 (#3888) | 0 | 0 | **∅ (not applicable)** | **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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