chore: Update font-sizes in DatabaseModal

[geido]

SUMMARY

This PR removes hacky usages of font-sizes by replacing them with the exact font-sizes available in the theme config.

BEFORE

DEV.Superset.1._b4.mp4

AFTER

DEV.Superset.1._after.mp4

TESTING INSTRUCTIONS

1. Open the Add / Edit Database modal
2. Make sure the font-sizes look balanced

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

[michael-s-molina]

LGTM

[codecov]

Codecov Report

Merging #19616 (7418f30) into master (4a835a4) will not change coverage.
The diff coverage is 75.00%.

❗ Current head 7418f30 differs from pull request most recent head 7d3a086. Consider uploading reports for the commit 7d3a086 to get more accurate results

@@           Coverage Diff           @@
##           master   #19616   +/-   ##
=======================================
  Coverage   66.51%   66.51%           
=======================================
  Files        1714     1714           
  Lines       65026    65026           
  Branches     6710     6710           
=======================================
  Hits        43249    43249           
  Misses      20070    20070           
  Partials     1707     1707           

Flag	Coverage Δ
javascript	51.22% <75.00%> (ø)

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

Impacted Files	Coverage Δ
...c/views/CRUD/data/database/DatabaseModal/styles.ts	76.69% <75.00%> (ø)

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