allow inspector pane content to scroll vertically

[davetsay]

Closes #7566

Describe your changes:

Introduced in #7037

• Kept horizontal overflow-x: hidden to prevent horizontal pane leaking
• Added vertical overflow-y: auto to allow vertical scrolling

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.02%. Comparing base (6486263) to head (22b4d66).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7567      +/-   ##
==========================================
- Coverage   59.75%   56.02%   -3.74%     
==========================================
  Files         430      672     +242     
  Lines       13454    27108   +13654     
  Branches        0     2629    +2629     
==========================================
+ Hits         8040    15188    +7148     
- Misses       5414    11598    +6184     
- Partials        0      322     +322     

Flag	Coverage Δ
e2e-full	23.60% <ø> (ø)
e2e-stable	59.70% <ø> (+0.03%)	⬆️
unit	49.08% <ø> (?)

Files	Coverage Δ
.../inspectorViews/properties/PropertiesComponent.vue	86.30% <ø> (ø)

... and 376 files with indirect coverage changes

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[davetsay]

Do it @unlikelyzero . Block it for visual tests.

[charlesh88]

Pushed up changes that altered this solution: we don't want the whole Inspector area to scroll, just the area beneath the tabs. With that, LGTM.