Add Linux extension for Flutter plugin

[heliocodacy]

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Pull request overview

This PR adds Linux-specific archive format support for the Flutter plugin by specifying the tar.xz extension for Linux platforms.

Changes:

• Added Linux platform extension mapping to use tar.xz format instead of the default zip

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.50%)	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (cf4ddcc)	5765	1157	20.07%
Head commit (7bf3dc8)	5765 (+0)	1157 (+0)	20.07% (+0.00%)

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 (#188)	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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Codacy's Analysis Summary

0 new issue (≤ 1 medium issue)
0 new security issue (≤ 0 issue)

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