requestMapper: Fix enabled services with firstboot

[regexowl]

Previously used .push() method was limited by non-writable length of the enabled services array, ending up in the following error:

 Uncaught (in promise) TypeError: can't define array index property past the end of an array with non-writable length

This fixes the problem by updating the array via spread operator.

Before: when creating an image with Oscap profile with enabled serviced and adding a firstboot script, the Create blueprint button at the Review step threw an error on click.
After fix: it's possible to create an image with Oscap profile that includes enabled services and a firstboot script.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.64%. Comparing base (1a7350e) to head (936b5e0).
Report is 2157 commits behind head on main.

Files with missing lines	Patch %	Lines
...nents/CreateImageWizard/utilities/requestMapper.ts	50.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main    #2464      +/-   ##
==========================================
+ Coverage   75.71%   83.64%   +7.93%     
==========================================
  Files          33      153     +120     
  Lines         597    17235   +16638     
  Branches      144     1673    +1529     
==========================================
+ Hits          452    14416   +13964     
- Misses        139     2800    +2661     
- Partials        6       19      +13     

Files with missing lines	Coverage Δ
...nents/CreateImageWizard/utilities/requestMapper.ts	94.54% <50.00%> (ø)

... and 2 files with indirect coverage changes

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[jrusz]

Tests fail on teardown, will be resolved soon in separate PR. I was able to create the blueprint manually. Integration tests will be ran in stage to verify, let's merge this please :)