Backport: Fix BOM validation failing when URL contains encoded `[` and `]` characters

[nscuro]

Description

Fixes BOM validation failing when URL contains encoded [ and ] characters.

Addressed Issue

Fixes #3831 Backports #3865

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: +0.08% (target: -1.00%)	:white_check_mark: ∅ (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (93a32e127adabd571631b199382306bac90e1e2c) | 22079 | 16809 | 76.13% | | | Head commit (5567233ba3babb78b27bd3149f1193741ad5a743) | 22060 (-19) | 16812 (+3) | 76.21% (**+0.08%**) | **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 (#3866) | 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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