[YUNIKORN-2120] Fix incorrect error message when check maxApplications in configValidator

[brandboat]

What is this PR for?

The error message use terms maxRunningApps when setup incorrect maxapplications in ConfigMap. Would be more explicit if we replace maxRunningApps with maxApplications.

error: configmaps "yunikorn-configs" could not be patched: admission webhook "admission-webhook.yunikorn.validate-conf" denied the request: parent maxRunningApps must be larger than child maxRunningApps

What type of PR is it?

• - Improvement

Todos

N/A

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2120

How should this be tested?

N/A

Screenshots (if appropriate)

N/A

Questions:

N/A

[FrankYang0529]

+1. Thanks!

[codecov]

Codecov Report

Merging #693 (3b63001) into master (d1fe998) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #693   +/-   ##
=======================================
  Coverage   77.62%   77.62%           
=======================================
  Files          80       80           
  Lines       13263    13263           
=======================================
  Hits        10295    10295           
  Misses       2648     2648           
  Partials      320      320           

Files	Coverage Δ
pkg/common/configs/configvalidator.go	93.23% <100.00%> (ø)

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