[doc] Rebrand privatelink traffic filters to private connectivity

[shainaraskas]

part of https://github.com/elastic/platform-docs-team/issues/682

prerequisites:

• Network sec: rebrand and new cloud UX, IP filters in serverless docs-content#1785
• traffic filters > network security: file renames and xlinks docs-content#2047

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What does this PR do?

Rebrands privatelink traffic filters to private connectivity based on a larger change to Elastic Cloud network security

Why is it important?

Network security terminology and docs are changing, making the existing doc link invalid

Checklist

- [ ] My code follows the style guidelines of this project
- [ ] I have commented my code, particularly in hard-to-understand areas

• I have made corresponding changes to the documentation

- [ ] I have made corresponding change to the default configuration files
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] I have added an entry in CHANGELOG.md and updated share/version.py, if my change requires a new release.

Author's Checklist

• preview docs

How to test this PR locally

link coming after preview CI runs

Related issues

part of https://github.com/elastic/platform-docs-team/issues/682

prerequisites:

• Network sec: rebrand and new cloud UX, IP filters in serverless docs-content#1785
• traffic filters > network security: file renames and xlinks docs-content#2047

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