RI-7835 align info icon and database alias in instance header

[pd-redis]

What

Remove vertical padding from db index button container and add inline-flex display to tooltip anchor for proper alignment.

Adding inline-flex wraps the span that is around anchor contents tightly and allows for flex alignment to kick in.
This 'fix' is kind of dirty because is one-off and uses scss, but appropriate considering the time preasure.
The tooltip component should be modified a little to accomodate for this use-case by default, but considering its wide use, probably now is not the moment to do it.

Before

After

Testing

Open browser page, see that info icon is aligned with rest of the header

---

Note

Aligns the Instance Header info icon and DB index button and adds Storybook stories covering key scenarios.

• UI/Styles (Instance Header)
  • Adjust FlexItem around DB index to use paddingLeft: 12 (removes vertical padding).
  • Set tooltip anchor (.tooltipAnchor) to display: inline-flex for proper info icon alignment; keep tooltip width cap.
• Storybook
  • Add instance-header/InstanceHeader.stories.tsx with scenarios: default, multiple databases, long name, Redis Stack, return URL, loading, DB index disabled, and cluster connection; includes Redux store setup via StorePopulator.

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[github-actions]

Code Coverage - Frontend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	82.89%	20964/25292
🟡	Branches	68.12%	8853/12996
🟡	Functions	77.91%	5724/7347
🟢	Lines	83.3%	20529/24646

Test suite run success

5446 tests passing in 703 suites.

Report generated by 🧪jest coverage report action from 7aefed5