fix: styling fixes around for App-Cloud integration

[mike-plummer]

Fixes styling issues in App-Cloud integration work:

1. Keep SpecList columns aligned with header columns when scrollable/non-scrollable
2. Remove hover coloration in tooltip
3. Align tooltip arrow

User facing changelog

Additional details

Steps to test

How has the user experience changed?

app-cloud-styling-fixes.mov

PR Tasks

• Have tests been added/updated?
• Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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