Fixes #6679 Correctly reference sourcemap filename in LCP script

[Tabrisrp]

Description

Update the gulp build task to rename before creating the sourcemap, so that the sourcemap filename is correct in both the minified file, and in the assets folder

Fixes #6679

Type of change

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

Checklists

Feature validation

• I validated all the Acceptance Criteria. If possible, provide sreenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.

Code style

• I wrote self-explanatory code about what it does.
• I named variables and functions explicitely.
• I protected entry points against unexpected inputs.
• I did not introduce unecessary complexity.
• I validated the repo-specific guidelines from CONTRIBUTING.md.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 350b61e1	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (350b61e)	Report Missing	Report Missing	Report Missing
Head commit (7a5b859)	37230	14396	38.67%

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 (#6681)	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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Footnotes

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[wordpressfan]

Amazing!

I only fixed merge conflicts because this was conflicting with this PR: #6677

[Miraeld]

Works great !