fix: handle enable monitoring boolean flag

[flavio]

A change has been done to policy-server. Starting from the v1.11 release, the boolean flags must take either true or false as values when they are toggled via environment variables. Prior to that, any kind of value was fine.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.45%. Comparing base (e7db4cf) to head (251ad8a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #676 +/- ## =========================================== + Coverage 42.17% 69.45% +27.28% =========================================== Files 23 5 -18 Lines 2006 478 -1528 =========================================== - Hits 846 332 -514 + Misses 1085 100 -985 + Partials 75 46 -29 ``` | [Flag](https://app.codecov.io/gh/kubewarden/kubewarden-controller/pull/676/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewarden) | Coverage Δ | | |---|---|---| | [integration-tests](https://app.codecov.io/gh/kubewarden/kubewarden-controller/pull/676/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewarden) | `69.45% <ø> (+0.41%)` | :arrow_up: | | [unit-tests](https://app.codecov.io/gh/kubewarden/kubewarden-controller/pull/676/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewarden) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewarden#carryforward-flags-in-the-pull-request-comment) to find out more.

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