Mark PlatformProvider as deprecated in models

[khanhtc1202]

What this PR does:

Mark Platform Provider as deprecated field in models: application, deployment, piped

Why we need it:

For pipedv1, the logic will no longer depend on platform providers. Instead, we will use plugins and deploy_targets.
The field is marked as deprecated so that data from pipedv0 can be stored normally

Which issue(s) this PR fixes:

Part of #5252

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 26.19%. Comparing base (90170ba) to head (f9f88cb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5512   +/-   ##
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  Coverage   26.19%   26.19%           
=======================================
  Files         464      464           
  Lines       49815    49815           
=======================================
  Hits        13049    13049           
  Misses      35733    35733           
  Partials     1033     1033           

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