chore: optimize apt_get_purge CSE func

[jackfrancis]

Reason for Change:

• make the retries, sleep timeout, and command timeout options static in the func (these options were common across all usages)
• do the "is this package already installed?" validation before purging in the func itself
• support multiple packages

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

Merging #2931 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2931   +/-   ##
=======================================
  Coverage   72.56%   72.56%           
=======================================
  Files         141      141           
  Lines       25863    25863           
=======================================
  Hits        18767    18767           
  Misses       6003     6003           
  Partials     1093     1093

[mboersma]

/lgtm

[acs-bot]

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