NO-ISSUE: Fix command syntax for getting postgres size

[CrystalChun]

The kubectl command was missing curly braces. The output would be: ".spec.resources.requests.storage", causing the rest of the script to error out.

List all the issues related to this PR

• New Feature
• Enhancement
• Bug fix
• Tests
• Documentation
• CI/CD

What environments does this code impact?

• Automation (CI, tools, etc)
• Cloud
• Operator Managed Deployments
• None

How was this code tested?

• assisted-test-infra environment
• dev-scripts environment
• Reviewer's test appreciated
• Waiting for CI to do a full test run
• Manual (Elaborate on how it was tested):
  • deployed subystem tests and make deploy-service-for-subsystem-test passed successfully.
  • Also added the following into tools/pvc_size_utils.py and ran $ python3 tools/pvc_size_utils.py to make sure the output was correct.

  if __name__ == "__main__":
      size = get_current_size_if_exist(target="local", namespace="assisted-installer", pvc_name="postgres-pv-claim")
      print(size)
  

• No tests needed

Checklist

• Title and description added to both, commit and PR.
• Relevant issues have been associated (see CONTRIBUTING guide)
• This change does not require a documentation update (docstring, docs, README, etc)
• Does this change include unit-tests (note that code changes require unit-tests)

Reviewers Checklist

• Are the title and description (in both PR and commit) meaningful and clear?
• Is there a bug required (and linked) for this change?
• Should this PR be backported?

/cc @omertuc @adriengentil

[codecov]

Codecov Report

Merging #4498 (e31b2e9) into master (3b9764e) will increase coverage by 0.16%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4498      +/-   ##
==========================================
+ Coverage   66.76%   66.93%   +0.16%     
==========================================
  Files         197      197              
  Lines       27622    27820     +198     
==========================================
+ Hits        18442    18621     +179     
- Misses       7536     7545       +9     
- Partials     1644     1654      +10     

Impacted Files	Coverage Δ
internal/bminventory/inventory.go	70.96% <0.00%> (+1.07%)	⬆️

[omertuc]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adriengentil, CrystalChun

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[openshift-ci]

@CrystalChun: all tests passed!

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