feat: Add jscpd as Dart duplication analysis tool

[nicklem]

Adds jscpd as the Dart duplication analysis tool

👀 Live preview

https://docs-691-update-supported-tools-tab--docs-codacy.netlify.app/getting-started/supported-languages-and-tools/

[codacy-production]

Adds jscpd for Dart Duplication Analysis

Introduces jscpd as a new tool for Dart duplication analysis.

• Updates the supported languages and tools documentation
• Adds jscpd to the Dart toolchain for duplication scanning

This change enhances the code quality analysis capabilities for Dart projects by detecting and reporting duplicated code.

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This comment was generated by an experimental AI tool (winner of the 2024 Codacy Hackathon 'People's Choice' and 'Most Valuable' awards).

[github-actions]

Overall readability score: 54.09 (🟢 +0)

File	Readability
supported-languages-and-tools.md	48.42 (🟢 +0)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
supported-languages-and-tools.md	48.42	31.48	10.52	13.5	14.9	7.72
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	54.09	43.1	10.8	12.44	12.56	7.91
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[claudiacarpinteiro]

LGTM! 👍