release notes: add OSISM 10.3.0

[berendt]

Adds the release notes section for OSISM 10.3.0, generated from the component CHANGELOGs between OSISM 10.2.0 and OSISM 10.3.0.

Generated with generate-release-changelog.sh using claude-sonnet-5. Please review the generated section before merging.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0		0	0.04s
✅ JSON	jsonlint	4		0		0	0.09s
✅ JSON	prettier	4		0		0	0.36s
✅ JSON	v8r	4		0		0	8.79s
✅ MARKDOWN	markdownlint	171		0		0	3.49s
✅ MARKDOWN	markdown-table-formatter	171		0		0	0.43s
✅ REPOSITORY	betterleaks	yes		no		no	0.93s
✅ REPOSITORY	checkov	yes		no		no	19.53s
✅ REPOSITORY	git_diff	yes		no		no	0.09s
✅ REPOSITORY	secretlint	yes		no		no	1.62s
✅ REPOSITORY	trufflehog	yes		no		no	4.14s
✅ SPELL	codespell	181		0		0	0.76s
⚠️ SPELL	lychee	181		1		0	39.32s
✅ YAML	prettier	6		0		0	0.55s
✅ YAML	v8r	6		0		0	7.39s
✅ YAML	yamllint	6		0		0	0.6s

Detailed Issues

⚠️ SPELL / lychee - 1 error

📝 Summary
---------------------
🔍 Total.........1172
🔗 Unique.........884
✅ Successful....1069
⏳ Timeouts.........1
🔀 Redirected.......9
👻 Excluded.......101
❓ Unknown..........0
🚫 Errors...........1
⛔ Unsupported......1

Errors in docs/guides/deploy-guide/metalbox.md
[404] https://github.com/osism/metalbox/blob/main/zuul/vars/container-images-openstack-2024.2.yml (at 83:101) | Rejected status code: 404 Not Found

Errors in docs/release-notes/osism-7.md
[TIMEOUT] https://www.openstack.org/software/openstack-bobcat (at 978:38) | Request timed out

Hint: Followed 9 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

See detailed reports in MegaLinter artifacts

Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@10.1.0 --custom-flavor-setup --custom-flavor-linters ACTION_ACTIONLINT,JSON_JSONLINT,JSON_V8R,JSON_PRETTIER,MARKDOWN_MARKDOWNLINT,MARKDOWN_MARKDOWN_TABLE_FORMATTER,REPOSITORY_CHECKOV,REPOSITORY_GIT_DIFF,REPOSITORY_BETTERLEAKS,REPOSITORY_SECRETLINT,REPOSITORY_TRUFFLEHOG,SPELL_LYCHEE,SPELL_CODESPELL,YAML_PRETTIER,YAML_YAMLLINT,YAML_V8R

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