disable caching secret, SA and configmap when the placementrule contr…

[xiangjingli]

…oller is started

• I have taken backward compatibility into consideration.

https://issues.redhat.com/browse/ACM-14957

The fix has two parts

• improve the placementrule controller reconciliation performance. The hot fix has been verified on scale test env and the customer site.
• enlarge the memory limit of the application-manager addon pod to 4G by default.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.72%. Comparing base (dfcbf0c) to head (a20bcf7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #414      +/-   ##
==========================================
+ Coverage   56.66%   56.72%   +0.06%     
==========================================
  Files          68       68              
  Lines       15248    15236      -12     
==========================================
+ Hits         8640     8643       +3     
+ Misses       5746     5730      -16     
- Partials      862      863       +1     

Flag	Coverage Δ
unit	56.72% <ø> (+0.06%)	⬆️

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[mikeshng]

/approve

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mikeshng, xiangjingli

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