Fix duplicate display studio sync

[akshay-gupta7]

Resolves #3069

Fixes an error where the Tokens Studio Sync Provider in the plugin was showing up twice.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• None of the above

How to test this

• Go to Settings Tab
• Click on Add New Sync Provider
• Choose Tokens Studio(Beta)
• Add API key and connection string
• Click on Save
• You should either see and error or a success. If you see an error, check your keys and click on save again. If successful, the Tokens Studio Sync provider should no show up only once in the list of sync providers

Screenshots or video (if necessary):

[changeset-bot]

🦋 Changeset detected

Latest commit: 8811070

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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[github-actions]

⤵️ 📦 ✨ The artifact was successfully created! Want to test it? Download it here 👀 🎁

[github-actions]

Commit SHA:32e72676f2134fd4e122073c2729dcd2c36e0c3d

Test coverage results 🧪

Code coverage diff between base branch:main and head branch: fix-duplicate-display-studio-sync 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🔴	total	67.88 (-0.03)	58.47 (0)	64.65 (-0.02)	68.27 (-0.02)
🔴	packages/tokens-studio-for-figma/src/app/components/StorageItemForm/TokensStudioForm.tsx	4 (-0.76)	0 (0)	0 (0)	4.16 (-0.84)

[github-actions]

Commit SHA:32e72676f2134fd4e122073c2729dcd2c36e0c3d
Current PR reduces the test coverage percentage by 1 for some tests

[six7]

This doesnt fix the issue for already duplicative registered providers. Also, the issue mentions this also happens for other sync providers such as Supernova, can you check that as well?