Cleanup: Remove container flag & make the builder dynamic (var II)

[gauron99]

Variant II

• This version creates a dynamic builder which prefers host builder instead of pack wherever possible, that means when a runtime has an oci builder.
• These changes are more complex and reaching greater multitude of systems, including changing some default behavior of current implementations and their respective tests in comparison to variant I.
• With this variant, upon creating oci builder for a new runtime would immediately prefer the host builder by default making the adoption and transition easier.
• The current "non standard" implementations could be reversed once the host builder becomes the standard default.

Changes

• 🧹 Remove the --container flag
• now the logic in run cmd uses the current builder
• assign host builder as default (not only for run) if runtime supports it, otherwise pack
• builder determination now depends on runtime

/kind cleanup
Fixes #2973

Release Note

Remove the --container flag - builds are determined via builder dynamically; Default to 'host' for oci-supported runtimes

Docs

[knative-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.68%. Comparing base (e4bd40b) to head (4ca5896).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/root.go	52.63%	6 Missing and 3 partials ⚠️
cmd/run.go	83.78%	3 Missing and 3 partials ⚠️
cmd/deploy.go	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2983      +/-   ##
==========================================
+ Coverage   58.95%   59.68%   +0.72%     
==========================================
  Files         132      132              
  Lines       16944    16936       -8     
==========================================
+ Hits         9990    10108     +118     
+ Misses       6025     5866     -159     
- Partials      929      962      +33     

Flag	Coverage Δ
e2e-tests	44.30% <71.01%> (+4.66%)	⬆️
integration-tests	54.36% <73.91%> (+1.55%)	⬆️
unit-tests	46.55% <73.91%> (+1.10%)	⬆️

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[gauron99]

Closing this in favor of variant I #2987