Added dummy search when creating detector on the given indicies

[stevanbz]

Description

[Describe what this change achieves]
Checks if user can access the given indices when creating detector

Implemented approach 2 from the issue listed below. Introduced dummy index search before detector creation happens, since once the detector is being created the context is stashed and from that point, the program continues the execution as a super user (which has an access to resources on altering and security analytics side).
That's why, the check has been introduced before the context is being stashed and follows the approach used in alerting.

One general note - security tests will fail because the index privilege action is not introduced for the security_analytics_full_access role

Issues Resolved

[List any issues this PR will resolve]
#182

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #197 (9b56898) into main (d663a79) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main     #197      +/-   ##
============================================
- Coverage     38.97%   38.87%   -0.10%     
+ Complexity      892      891       -1     
============================================
  Files           176      176              
  Lines          6746     6758      +12     
  Branches        823      824       +1     
============================================
- Hits           2629     2627       -2     
- Misses         3876     3889      +13     
- Partials        241      242       +1     

Impacted Files	Coverage Δ
...lytics/transport/TransportIndexDetectorAction.java	0.00% <0.00%> (ø)
...g/opensearch/securityanalytics/model/Detector.java	69.89% <0.00%> (-0.70%)	⬇️
...analytics/transport/TransportSearchRuleAction.java	0.00% <0.00%> (ø)

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