[RUM-13689] Update react-navigation view key format sent with view events

[cdn34dd]

What does this PR do?

Changes the format of the View key format sent to Datadog used my react-navigation to match the standard view format used by other mobile SDKs. This does not change any of the internal functionality of the SDK, it simply changes the format of the view key that is sent.

Aside from the key format correction, this change also fixes an issue with url_path_group that was getting incorrectly calculated due to the wrong format.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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