Fix broken pricing page links in release post badges

Why is this change being made?

Fixes broken and inconsistent pricing page links in release post feature badges to use the correct deployment-specific URLs.

Currently, several badge links are broken or point to incorrect sections:

• GitLab Dedicated badges link to /pricing/#single-tenant-saas (broken anchor)
• All add-on badges link to /pricing/#gitlab-com regardless of which offering they appear under

This change updates all pricing links to use the deployment-specific query parameters that properly filter the pricing page content.

Changes

• Update all pricing links to use consistent deployment-specific query parameters:
  • GitLab.com badges: /pricing/?deployment=saas
  • Self-Managed badges: /pricing/?deployment=self-managed-deployment
  • GitLab Dedicated badges: /pricing/?deployment=dedicated
• Update add-on badge links to match their parent section's deployment instead of always pointing to GitLab.com
• Update tooltip text to use correct offering names:
  • "GitLab SaaS" → "GitLab.com"
  • "GitLab self-managed" → "GitLab Self-Managed"

Review app

https://release-posts-fix-links-to-pricing.about.gitlab-review.app/releases/2025/11/20/gitlab-18-6-released/

I manually verified that the URLs filter the pricing page as expected:

• https://about.gitlab.com/pricing/?deployment=saas
• https://about.gitlab.com/pricing/?deployment=self-managed-deployment
• https://about.gitlab.com/pricing/?deployment=dedicated

However, I was unable to build all dependencies required for end-to-end testing.

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Please verify the check list and ensure to tick them off before the MR is merged.

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Commits

• Fix broken pricing page links in release post badges

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