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Fix ENABLE_METADATA_CONCEALMENT firewall rules to respect true/false

**What this PR does / why we need it**: Fix ENABLE_METADATA_CONCEALMENT firewall rules to respect true/false; fixes introduced in #54150 (env var value of 'false' would trigger this).  Ref #8867.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```