[improvement] Increase RLIMIT_MEMLOCK in containers

[dthorsen]

What this PR does / why we need it:
On kernel versions older than 5.16, the default RLIMIT_MEMLOCK in containers is quite low, at 64KB. Newer kernels set the limit to 8MB. This PR increases RLIMIT_MEMLOCK to 8MB in containerd, so that containerized workloads that require more locked memory work on nodes with older linux kernel versions.

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.76%. Comparing base (758c935) to head (7904e5e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #860   +/-   ##
=======================================
  Coverage   64.76%   64.76%           
=======================================
  Files          71       71           
  Lines        7871     7871           
=======================================
  Hits         5098     5098           
  Misses       2465     2465           
  Partials      308      308           

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