[YUNIKORN-2377] Fix kubectl: executable file not found in PATH for e2e

[lowc1012]

What is this PR for?

• Add yunikorn-k8shim/tools into PATH for e2e_test

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

YUNIKORN-2377

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c543ece) 71.13% compared to head (f59ab75) 71.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #775      +/-   ##
==========================================
- Coverage   71.13%   71.12%   -0.02%     
==========================================
  Files          43       43              
  Lines        7691     7691              
==========================================
- Hits         5471     5470       -1     
  Misses       2018     2018              
- Partials      202      203       +1     

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[chia7712]

LGTM