fix(AlertReports): disabling value when not null option is active

[fisjac]

SUMMARY

Adding a small change to the logic to ensure that no value is shown when "Not Null" is selected as an option.
Removed the required asterisk when not null is selected.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:
After:

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags: ALERT_REPORTS
• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 67.48%. Comparing base (ae29427) to head (e42db83).
Report is 42 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #27550      +/-   ##
==========================================
+ Coverage   67.36%   67.48%   +0.11%     
==========================================
  Files        1909     1911       +2     
  Lines       74744    75063     +319     
  Branches     8329     8479     +150     
==========================================
+ Hits        50352    50653     +301     
+ Misses      22342    22339       -3     
- Partials     2050     2071      +21     

Flag	Coverage Δ
javascript	57.52% <ø> (+0.29%)	⬆️

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[john-bodley]

Thanks @fisjac for the fix. Would you mind adding a unit test to ensure this behavior doesn't regress in the future?