Add changelog for CAPZ v1.14.3

[mboersma]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Adds a changelog file for the impending CAPZ v1.14.3 patch release.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[nojnhuh]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nojnhuh

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Needs approval from an approver in each of these files:

• OWNERS [nojnhuh]

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 29107803b1e8d3c2fad09e841e35b8d46090dddc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.35%. Comparing base (f71c5ed) to head (e34594f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4779   +/-   ##
=======================================
  Coverage   62.35%   62.35%           
=======================================
  Files         196      196           
  Lines       16192    16192           
=======================================
  Hits        10097    10097           
  Misses       5362     5362           
  Partials      733      733           

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