feat(action): support refresh of ExternalSecret

[agaudreault]

Implement the refresh behavior as described in https://external-secrets.io/v0.8.3/api/externalsecret/#update-behavior

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (3a1030b) 49.61% compared to head (a047ec3) 49.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13951      +/-   ##
==========================================
- Coverage   49.61%   49.61%   -0.01%     
==========================================
  Files         256      256              
  Lines       43934    43934              
==========================================
- Hits        21800    21797       -3     
- Misses      19975    19977       +2     
- Partials     2159     2160       +1     

see 1 file with indirect coverage changes

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