chore: add set docker host by current context

[ericzzzzzzz]

Fixes: #9028

• The original ask from useDockerCli flag should enforce all operations in scope of docker builder to use command line #9028 is to enforce all operations under a builder scope to use cli when useCli is set to true when using docker, but after revisiting several issues linked in useDockerCli flag should enforce all operations in scope of docker builder to use command line #9028, the core problem we want to fix is that when DOCKER_HOST env is not set, golang docker rest api client use a hard coded value as docker engine host for example, unix:///var/run/docker.sock on mac, but docker command line client use the socket from docker current context as host.
• This pr changes the hard coded value by inspecting the host of docker current context with docker client, if the DOCKER_HOST is not set, we should use the value from docker current context. If the value is set, both docker command line and golang rest client will honor the env variable.
• This approach should solve the linked issues in useDockerCli flag should enforce all operations in scope of docker builder to use command line #9028, and much easier to maintain than duplicating similar logics with command line client.

[codecov]

Codecov Report

Merging #9094 (1ce6f9b) into main (290280e) will decrease coverage by 7.06%.
Report is 1028 commits behind head on main.
The diff coverage is 48.90%.

@@            Coverage Diff             @@
##             main    #9094      +/-   ##
==========================================
- Coverage   70.48%   63.43%   -7.06%     
==========================================
  Files         515      628     +113     
  Lines       23150    32293    +9143     
==========================================
+ Hits        16317    20484    +4167     
- Misses       5776    10248    +4472     
- Partials     1057     1561     +504     

Files Changed	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <0.00%> (ø)
... and 41 more

... and 431 files with indirect coverage changes

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[ericzzzzzzz]

I was looking into the alternative way to simplify the whole newEnvAPIClient() method with "github.com/docker/cli/cli/command" , https://pkg.go.dev/github.com/docker/cli/cli/command#DockerCli.CurrentContext seems to have everything we need, it also helps set up ssh connection helper implemented in #8349, but it seems that the tls config has different behavior from the current setup, maybe we can revisit this later.

	var opts = []client.Opt{client.WithHTTPHeaders(getUserAgentHeader())}

	cli, err := command.NewDockerCli()
	if err != nil {
		return nil, nil, fmt.Errorf("fail to create dockerCli instance %w", err)
	}
	err = cli.Initialize(flags.NewClientOptions())
	if err != nil {
		return nil, nil, fmt.Errorf("fail to initialize dockerCli instance %w", err)
	}
	endpoint := cli.DockerEndpoint()
	clientOpts, err := endpoint.ClientOpts()
	if err != nil {
		return nil, nil, fmt.Errorf("fail to get dockerCli endpoint options %w", err)
	}
	opts = append(opts, clientOpts...)
	c, err := client.NewClientWithOpts(opts...)