Add StartTimeout handling to Docker Runner

[intojhanurag]

Description

This PR adds StartTimeout support to the Docker Runner (pkg/docker/runner.go).
The Runner now waits for the container to become ready within a configurable timeout and returns an error if it does not start in time.

[knative-prow]

Hi @intojhanurag. Thanks for your PR.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.69%. Comparing base (b990215) to head (7f0006f).
⚠️ Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/docker/runner.go	50.00%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3135      +/-   ##
==========================================
+ Coverage   58.31%   58.69%   +0.38%     
==========================================
  Files         134      134              
  Lines       17377    17397      +20     
==========================================
+ Hits        10134    10212      +78     
+ Misses       6302     6214      -88     
- Partials      941      971      +30     

Flag	Coverage Δ
e2e-tests	40.26% <50.00%> (+1.36%)	⬆️
integration-tests	54.72% <52.94%> (+2.46%)	⬆️
unit-tests	46.16% <0.00%> (-0.06%)	⬇️

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[intojhanurag]

Hey @gauron99 , Please can you review this one ? if you have a moment.

[lkingland]

/lgtm
This might be a duplicate PR?

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: intojhanurag, lkingland

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