Fixes #6948 -- rocket_lrc_processed_tags should be case insensitive

[Khadreal]

Description

Make filter value case insensitive

Fixes #6948

Type of change

• Bug fix (non-breaking change which fixes an issue).

Detailed scenario

Check #6948 for scenario

Technical description

Convert filter values to upper case in get_processed_tags method.

Documentation

Make sure filter value are case insensitive.

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I did not introduce unnecessary complexity.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
❌ -43.63% (target: -0.10%)	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4d7b54b)	37912	16541	43.63%
Head commit (2eb92d2)	0 (-37912)	0 (-16541)	0.00% (-43.63%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6949)	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: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[MathieuLamiot]

@Khadreal what do you think of an integration test that registers a callback to the filter, adding lowercase items, and checking the output of the method to ensure they are uppercase?
I am confident your code works, but it could help capturing the behavior in case we refactor something later on?

[Khadreal]

If this PR is merged first then this would need to be updated.

[MathieuLamiot]

I replicated the problematic scenario and it works as expected.