Add life of folder metrics

[hithwen]

Add metrics to measure how old a folder is / when was last modified same as we do with files Includes changes from https://github.com/DataDog/integrations-core/pull/12107

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[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e742bfe) 89.62% compared to head (4da4a32) 87.63%. Report is 2048 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
argocd	?
boundary	?
cert_manager	?
cloudera	?
ddev	?
directory	96.08% <91.42%> (-0.42%)	:arrow_down:
ibm_ace	?
impala	?

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