Add pre-commit hook for yaml formatting

[gab-arrobo]

No description provided.

[Copilot]

Pull request overview

This pull request introduces YAML auto-formatting via pre-commit and applies consistent formatting across existing YAML files in the repository.

Changes:

• Add google/yamlfmt as a pre-commit hook to automatically format YAML.
• Reformat various YAML configuration and GitHub workflow files (primarily whitespace/indentation normalization).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pcftests/pcfcfg.yaml	Normalizes YAML indentation for serviceList entries and removes stray whitespace-only line.
factory/pcfcfg.yaml	Removes whitespace-only line after SPDX headers (formatting-only).
factory/pcfcfg_with_custom_webui_url.yaml	Removes whitespace-only line after SPDX headers (formatting-only).
.pre-commit-config.yaml	Reformats the config for consistent indentation and adds the yamlfmt hook.
.golangci.yml	Removes whitespace-only line after SPDX headers (formatting-only).
.github/workflows/stale.yml	Removes whitespace-only blank lines (formatting-only).
.github/workflows/push.yml	Removes whitespace-only blank lines (formatting-only).
.github/workflows/main.yml	Removes whitespace-only blank lines (formatting-only).
.github/dependabot.yml	Removes whitespace-only blank lines (formatting-only).

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