Add DetermineVersions rpc to PlannerService

[khanhtc1202]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Follow PR #5015

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 22.47%. Comparing base (d362879) to head (51538ca).
Report is 193 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5047      +/-   ##
==========================================
+ Coverage   22.45%   22.47%   +0.02%     
==========================================
  Files         522      522              
  Lines       57041    57041              
==========================================
+ Hits        12809    12822      +13     
+ Misses      43204    43192      -12     
+ Partials     1028     1027       -1     

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[Warashi]

LGTM

MEMO:
The implementation will be something like this.

pipecd/pkg/app/piped/planner/kubernetes/kubernetes.go

Lines 501 to 503 in 5acc6e1

	// determineVersions decides artifact versions of an application.
	// It finds all container images that are being specified in the workload manifests then returns their names, version numbers, and urls.
	func determineVersions(manifests []provider.Manifest) ([]*model.ArtifactVersion, error) {

[ffjlabo]

🚀