update valid env var pattern

[christianvogt]

https://issues.redhat.com/browse/RHOAIENG-12440

Description

Restrict env var names to valid C identifiers as denoted by pattern: ^[_a-zA-Z][_a-zA-Z0-9]*$

Updated all mocks and tests to conform to the new pattern.

Updated error message

How Has This Been Tested?

Login as an admin
Go to Settings -> Connection types
Create a new connection type
Add a field
enter valid and invalid values for the env var

Observe the error is displayed and Add button disabled when an invalid env var value is entered.

Test Impact

update unit tests

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

cc @simrandhaliw

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.27%. Comparing base (aa3ef61) to head (c08261f).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3175   +/-   ##
=======================================
  Coverage   85.27%   85.27%           
=======================================
  Files        1258     1258           
  Lines       27689    27690    +1     
  Branches     7372     7372           
=======================================
+ Hits        23612    23613    +1     
  Misses       4077     4077           

Files with missing lines	Coverage Δ
frontend/src/concepts/connectionTypes/utils.ts	92.85% <100.00%> (+0.26%)	⬆️
...ctionTypes/manage/ConnectionTypeDataFieldModal.tsx	86.11% <100.00%> (+1.17%)	⬆️

... and 1 file with indirect coverage changes

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