feat: Add health checks for ServiceBinding and ServiceInstance

[dzahariev]

Add health check for ServiceBinding and ServiceInstance resources managed by sap-btp-service-operator.

The resources can have status type "Succeeded" or "Failed" and for values are one of "True" or "False".
In following 2 cases resource is considered as "Degraded":

• (Succeeded:False)
• (Failed:True)

In case status is missing the resource it is considered as "Progressing"
And in all other cases it is considered as "Healthy"

Checklist:

• (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Title of the PR
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.78%. Comparing base (95b191d) to head (a3764c5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #24928      +/-   ##
==========================================
- Coverage   60.79%   60.78%   -0.01%     
==========================================
  Files         351      351              
  Lines       60439    60439              
==========================================
- Hits        36745    36739       -6     
- Misses      20772    20781       +9     
+ Partials     2922     2919       -3     

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