chore: Updates Metrics and Columns font-size

[michael-s-molina]

SUMMARY

Updates Metrics and Columns font-size to match control headers.

@kasiazjc

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1 - Go to Explore
2 - Check the new font sizes

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20526 (cd455fa) into master (c348a09) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #20526   +/-   ##
=======================================
  Coverage   66.86%   66.86%           
=======================================
  Files        1751     1751           
  Lines       65429    65429           
  Branches     6912     6912           
=======================================
  Hits        43746    43746           
  Misses      19934    19934           
  Partials     1749     1749           

Flag	Coverage Δ
javascript	51.85% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...d/src/explore/components/DatasourcePanel/index.tsx	69.33% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c348a09...cd455fa. Read the comment docs.