Move S2I scaffolding from .s2i/ to .func/build/ for go/python runtimes.

[gauron99]

• Move the generated .s2i/* files during s2i build with scaffold-enabled runtimes into .func/build to align it with the other builders. All should now be the same.
• Update Tekton pipelines to use custom assemble scripts for Go/Python

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

❌ Patch coverage is 67.18750% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.54%. Comparing base (53dcc03) to head (c087be4).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/scaffolding/scaffold.go	58.82%	10 Missing and 4 partials ⚠️
pkg/s2i/scaffolder.go	50.00%	1 Missing and 2 partials ⚠️
pkg/oci/scaffolder.go	0.00%	1 Missing and 1 partial ⚠️
pkg/pipelines/tekton/templates.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3436      +/-   ##
==========================================
+ Coverage   54.51%   54.54%   +0.02%     
==========================================
  Files         179      179              
  Lines       20274    20318      +44     
==========================================
+ Hits        11052    11082      +30     
- Misses       8050     8060      +10     
- Partials     1172     1176       +4     

Flag	Coverage Δ
e2e	38.50% <60.00%> (+0.06%)	⬆️
e2e go	32.70% <60.00%> (+0.07%)	⬆️
e2e node	28.49% <10.00%> (-0.06%)	⬇️
e2e python	32.11% <22.00%> (-0.04%)	⬇️
e2e quarkus	28.63% <10.00%> (-0.06%)	⬇️
e2e rust	28.05% <4.00%> (-0.06%)	⬇️
e2e springboot	26.51% <4.00%> (-0.05%)	⬇️
e2e typescript	28.62% <10.00%> (-0.04%)	⬇️
integration	17.54% <8.00%> (-0.01%)	⬇️
unit macos-14	42.36% <56.00%> (+0.13%)	⬆️
unit macos-latest	42.36% <56.00%> (+0.13%)	⬆️
unit ubuntu-24.04-arm	42.65% <59.37%> (+0.11%)	⬆️
unit ubuntu-latest	43.25% <56.00%> (+0.12%)	⬆️
unit windows-latest	42.38% <56.00%> (+0.13%)	⬆️

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[lkingland]

So glad to see us using .func consistently now

[matejvasek]

note: podman failure is related to this PR, override it

[knative-prow]

New changes are detected. LGTM label has been removed.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99

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