fix: prevent plugin freeze on stale Slot node IDs during theme switching

[akshay-gupta7]

Why does this PR exist?

Closes #3838

What does this pull request do?

Testing this change

Additional Notes (if any)

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Latest commit: ffb5d05

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

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Complexity	0
Duplication	0

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[github-actions]

Commit SHA:3321ba664bcb72e643a17bf6bacfdb0f01e1e24b

Test coverage results 🧪

Code coverage diff between base branch:main and head branch: akshay/fix-slots-them-freezing-issue 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🔴	total	61.46 (-0.01)	52.9 (0)	59.3 (0.01)	61.85 (-0.02)
🔴	packages/tokens-studio-for-figma/src/plugin/SharedDataHandler.ts	34.48 (-0.52)	10 (0)	66.66 (0)	34.48 (-0.52)
🟢	packages/tokens-studio-for-figma/src/plugin/asyncMessageHandlers/applySiblingStyle.ts	45.65 (1.47)	56 (-0.25)	66.66 (6.66)	42.85 (1.39)
🟢	packages/tokens-studio-for-figma/src/plugin/figmaUtils/styleUtils.ts	53.84 (0)	76.47 (1.47)	57.14 (0)	53.84 (0)

[github-actions]

Commit SHA:3321ba664bcb72e643a17bf6bacfdb0f01e1e24b
Current PR reduces the test coverage percentage by 1 for some tests

[github-actions]

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