Added tests for default environment under cel package

[Manoramsharma]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Added unit tests for default and environment under cel package

Which issue(s) this PR fixes:

Fixes #

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This pull-request has been approved by: Manoramsharma
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[Manoramsharma]

@wzshiming I observed same check for binary runtime failed with an error message this Test kwokctl/kwokctl_binary_benchmark failed. .

So I changed the default_test.go writing units tests by testify assert rule and made a final commit but again got this lint error which says

  Running [/home/runner/golangci-lint-1.58.2-linux-amd64/golangci-lint run  --timeout=30m --config=.golangci.yaml] in [/home/runner/work/kwok/kwok] ...
  Received 3446 of 3446 (100.0%), 0.0 MBs/sec
  level=warning msg="[config_reader] The configuration option `linters.errcheck.ignore` is deprecated, please use `linters.errcheck.exclude-functions`."
  level=error msg="Running error: context loading failed: no go files to analyze: running `go mod tidy` may solve the problem"

Note: I am working a fork which has latest changes from upstream/main . Looking forward for your guidance over this.

Thanks

[Manoramsharma]

Test/ test-kwok-e2e check is working fine on my local system. Providing you the screenshot of the passing test below:

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