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: a9edad4

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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0 new issues

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🟢 Metrics 0 duplication

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[github-actions]

Commit SHA:e0592ee469cebfe9783f6d93acfb102546b53e29

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	61.5 (0.03)	52.99 (0.09)	59.3 (0.01)	61.88 (0.01)
🔴	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/setValuesOnVariable.ts	84.65 (0.12)	77.33 (0.15)	82.35 (0)	84.88 (0.14)
🟢	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/utils/figma/variableMetadata.ts	80 (-0.95)	83.33 (2.08)	80 (0)	83.33 (-3.33)

[github-actions]

Commit SHA:e0592ee469cebfe9783f6d93acfb102546b53e29
Current PR reduces the test coverage percentage by 1 for some tests