fix: add CMAKE_VERSION override to bitrise.yml for RN 0.81 compatibility (#29922)

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## **Description**

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React Native 0.81's ReactAndroid/build.gradle.kts resolves the CMake
version via System.getenv("CMAKE_VERSION") ?: "3.30.5", defaulting to
3.30.5 when the environment variable is not set.

Bitrise CI machines only ship CMake 3.22.1, and AGP cannot auto-download
the missing version,
  resulting in [CXX1300] CMake '3.30.5' was not found build failures.

This PR sets CMAKE_VERSION: '3.22.1' as an app-level environment
variable in bitrise.yml, directing
the build to use the pre-installed version. This is safe since RN's
CMakeLists files only require
  CMake >= 3.13.

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## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
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- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
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Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] I've tested with a power user scenario
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SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk CI-only change that adds an environment override; impact is
limited to Android build tooling selection on Bitrise.
> 
> **Overview**
> Ensures Bitrise Android builds use the preinstalled CMake by adding an
app-level `CMAKE_VERSION: '3.22.1'` environment variable in
`bitrise.yml`, preventing React Native 0.81 builds from defaulting to a
missing CMake version.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ab924f7. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adnxy

bitrise.yml

@@ -3526,6 +3526,9 @@ app:
     - opts:
         is_expand: false
       NDK_VERSION: 26.1.10909125
+    - opts:
+        is_expand: false
+      CMAKE_VERSION: '3.22.1'
     - opts:
         is_expand: false
       QA_APK_NAME: app-qa-release