add tool functions BuildBestEffortPod and BuildPodWithPriority

[Thor-wl]

The tool functions will be used in the UT of shuffle action.
Ref: https://github.com/volcano-sh/volcano/pull/2099/files
Signed-off-by: Thor-wl [email protected]

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[shinytang6]

why not include this pr in #2099?

[Thor-wl]

why not include this pr in #2099?

I also suggest like that. @k82cn advised to separate the whole PR into different small functions in order to have a good glimpse of the code for reviewer. I think that is also reasonable. These PRs should be merged befrore shuffle action so that that PR can pass the CI.

[k82cn]

I also suggest like that. @k82cn advised to separate the whole PR into different small functions in order to have a good glimpse of the code for reviewer.

My suggstion is to create two PRs, one for action, the other for plugins; and those two PRs should not have dependency with each other :)