fix(valkey): create deployment namespace

[Tadas Sutkaitis (fitbeard)]

What changed

• create the configured Valkey namespace before creating certificate resources;
• add a release note.

Why

Valkey created namespaced certificate resources before ensuring the target namespace existed. This made the role depend on unrelated deployment ordering.

This production fix is extracted from #4152 so it can be reviewed, released, and backported independently from selective CI.

Validation

• file-scoped pre-commit hooks passed;
• git diff --check passed;
• the repository-wide Ansible lint traversal reached all roles and only failed on the existing galaxy[no-changelog] metadata issue;
• Reno parsed the new note and only reported the repository's existing duplicate release-note UID.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Replace the literal newline escape in the release note

When Reno renders this YAML literal block into CHANGELOG.rst, \n is preserved as visible text rather than interpreted as a line break, so the published note will contain before\n creating. Split the sentence across an actual YAML line break instead.

AGENTS.md reference: AGENTS.md:L18-L23

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[vexxhost-bot]

Successfully created backport PR for stable/2023.2:

• [Backport stable/2023.2] fix(valkey): create deployment namespace #4304

[vexxhost-bot]

Successfully created backport PR for stable/2024.1:

• [Backport stable/2024.1] fix(valkey): create deployment namespace #4305

[vexxhost-bot]

Successfully created backport PR for stable/2024.2:

• [Backport stable/2024.2] fix(valkey): create deployment namespace #4309

[vexxhost-bot]

Successfully created backport PR for stable/2025.1:

• [Backport stable/2025.1] fix(valkey): create deployment namespace #4314

[vexxhost-bot]

Successfully created backport PR for stable/2025.2:

• [Backport stable/2025.2] fix(valkey): create deployment namespace #4319