chore: increase auto-generated cert expiration to 30 years

[jackfrancis]

Reason for Change:

For folks not submitting their own certificates, let's increase the expiration of the auto-generated certs we provide for them. In practice, expired certs render a cluster 100% inoperable.

@qike-ms @thomas1206 @jwilder @sauryadas @seanmck FYI

Issue Fixed:

Requirements:

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

Notes:

[acs-bot]

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This pull-request has been approved by: jackfrancis

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[codecov]

Codecov Report

Merging #396 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #396      +/-   ##
==========================================
- Coverage   53.42%   53.42%   -0.01%     
==========================================
  Files          95       95              
  Lines       14361    14363       +2     
==========================================
  Hits         7673     7673              
- Misses       6025     6027       +2     
  Partials      663      663

[CecileRobertMichon]

lgtm