thanos_sidecar: remove the network table row

[ideaship]

What

Removes the thanos_sidecar_network row from docs/appendix/networks.md. The freed 172.31.101.192/28 block is left as a gap (the remaining rows are fixed allocations, not renumbered).

Why

Retire the thanos_sidecar role/service entirely (osism/issues#1402): its image
quay.io/thanos/thanos is frozen at v0.32.5 (unchanged since 2023-12-18) and its
role-default # renovate: annotation is inert (the file is not in the collection's
renovate.json fileMatch), so it cannot be maintained — drop it rather than wire it
into release-managed pinning.

Coordinated set — must land together

Four PRs for osism/issues#1402; deleting the role while its deploy playbook survives
would break the playbook, so they merge as a set:

• thanos_sidecar: drop the role and service ansible-collection-services#2136 — remove the role (+ molecule test + .zuul.yaml job)
• thanos_sidecar: remove the deploy playbook ansible-playbooks#565 — remove the deploy playbook
• thanos_sidecar: remove the inventory group generics#607 — remove the inventory group
• thanos_sidecar: remove the network table row #1025 — remove the network doc row

⚠️ Deploy-behaviour change

thanos_sidecar is enabled by default (enable_thanos_sidecar | default('true')) and
deploys to the prometheus group, so merging this set stops deploying the Thanos
sidecar on the next run. Please confirm this is acceptable for existing deployments.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0	0	0.09s
✅ JSON	jsonlint	4		0	0	0.12s
✅ JSON	prettier	4		0	0	0.45s
✅ JSON	v8r	4		0	0	7.88s
✅ MARKDOWN	markdownlint	156		0	0	2.35s
✅ MARKDOWN	markdown-table-formatter	156		0	0	0.47s
✅ REPOSITORY	betterleaks	yes		no	no	0.8s
✅ REPOSITORY	checkov	yes		no	no	19.25s
✅ REPOSITORY	git_diff	yes		no	no	0.06s
✅ REPOSITORY	secretlint	yes		no	no	1.69s
✅ REPOSITORY	trufflehog	yes		no	no	4.51s
✅ SPELL	codespell	166		0	0	0.61s
⚠️ SPELL	lychee	166		3	0	14.0s
✅ YAML	prettier	6		0	0	0.46s
✅ YAML	v8r	6		0	0	6.56s
✅ YAML	yamllint	6		0	0	0.53s

Detailed Issues

⚠️ SPELL / lychee - 3 errors

📝 Summary
---------------------
🔍 Total..........879
🔗 Unique.........719
✅ Successful.....814
⏳ Timeouts.........1
🔀 Redirected......48
👻 Excluded........61
❓ Unknown..........0
🚫 Errors...........3
⛔ Unsupported......3

Errors in docs/guides/configuration-guide/openstack/index.md
[404] https://github.com/openstack/kolla/blob/master/docker/base/set_configs.py (at 370:30) | Rejected status code: 404 Not Found
[404] https://github.com/openstack/kolla/blob/master/docker/base/start.sh (at 369:37) | Rejected status code: 404 Not Found

Errors in docs/guides/developer-guide/style-guide.md
[TIMEOUT] https://wiki.openstack.org/wiki/GitCommitMessages (at 79:1) | Request timed out

Errors in docs/release-notes/index.md
[ERROR] https://release.osism.tech/ (at 11:1) | Connection failed. Check network connectivity and firewall settings

Hint: Followed 48 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

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