refactor: simplify inspectContainerWithRetries

[alexandear]

The PR refactors implementation of the inspectContainerWithRetries function by placing retry into the init and post statements in the for loop. Also, reduces the scope of the err variable.

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
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• I have added tests that prove my fix is effective or that my feature works.
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Further comments

Follows #533