fix(lineage): Fix lineage entity drawer height UI bug

[chriscollins3456]

When the width of a screen is small or an entity has enough path crumbs so that the browse path in the entity profile nav bar is wide enough to push content in this nav bar onto a second line, this second line gets covered up by the EntityDrawer that pops out from the left.

Since the EntityDrawer is an abolsutely positioned element and there's no easy way to contain it within its parent, we have to set the distance from the top of the page. In order to make this more dynamic for varying heights of EntityProfileNavBar I'm setting an empty div above the drawer and a ref on that div to get the offsetTop of it so we know how far to push down the drawer.

Here's the issue before the fix:

Here it is after the fix:

And it still looks good when it's only on one line:

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (build & test)

  97 files  ±0    97 suites  ±0   18m 1s ⏱️ - 11m 26s
701 tests ±0  642 ✔️ ±0  59 💤 ±0  0 ❌ ±0 

Results for commit c43611b. ± Comparison against base commit bb0a87a.