chore: Move edit dataset lock

[lyndsiWilliams]

SUMMARY

Moved the edit dataset lock to the top of the component in order to increase visibility.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TESTING INSTRUCTIONS

• Observe the described changes in the Edit Dataset model under the "Source" tab.

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 #17930 (8a5e4a9) into master (97a78d3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #17930   +/-   ##
=======================================
  Coverage   67.07%   67.07%           
=======================================
  Files        1609     1609           
  Lines       64903    64903           
  Branches     6866     6866           
=======================================
  Hits        43535    43535           
  Misses      19502    19502           
  Partials     1866     1866           

Flag	Coverage Δ
javascript	53.77% <100.00%> (ø)

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

Impacted Files	Coverage Δ
...end/src/components/Datasource/DatasourceEditor.jsx	68.93% <100.00%> (ø)

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[eschutho]

cc @yousoph