Add application livestate version in livestatereporter for pipedv1

[ffjlabo]

What this PR does:

as title.
It is required for the pipedv0, especially k8s. It is used to update livestate by using the diff from an older version.
Currently, the logic is used only for k8s livestate, and the others are not considered it.

https://github.com/pipe-cd/pipecd/blob/7a07070328e3d36a70c303f3f0c6a9b1f6076cfc/pkg/app/server/applicationlivestatestore/store.go#L93C1-L130C2

Why we need it:

Currently, we don't use it after pipedv1, but we use it in the Control Plane to update k8s livestate for apps managed by pipedv0.
So just added to pass the validation.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.67%. Comparing base (57c48c1) to head (99da0c9).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5682   +/-   ##
=======================================
  Coverage   25.66%   25.67%           
=======================================
  Files         474      476    +2     
  Lines       50905    50897    -8     
=======================================
  Hits        13066    13066           
+ Misses      36848    36841    -7     
+ Partials      991      990    -1     

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[Warashi]

LGTM

We can choose a method that removes the validation, but I think it's better to leave the timestamp field so we can see how old the live state is.