Normalize how we store themes in localstorage

[graygilmore]

WHY are these changes introduced?

• Fixes https://github.com/Shopify/developer-tools-team/issues/739

WHAT is this pull request doing?

How to test your changes?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.45% (+0.03% 🔼)	13319/16978
🟡	Branches	72.45% (+0.04% 🔼)	6504/8977
🟡	Functions	78.61% (+0% 🔼)	3461/4403
🟡	Lines	78.81% (+0.03% 🔼)	12597/15984

Test suite run success

3154 tests passing in 1330 suites.

Report generated by 🧪jest coverage report action from 916dce0

[graygilmore]

/snapit

[github-actions]

🫰✨ Thanks @graygilmore! Your snapshot has been published to npm.

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