Tweak file listing to omit .git directory

[HeavyWombat]

Changes

In almost all cases, the .git directory content is not directly helpful in the file listing and it leads to a lot of noise in the output.

Do not show .git files in file listing, but show a summary of size and file count at the end in the footer section.

$ git-step --url https://github.com/shipwright-io/sample-go --target /tmp/workspace/source --show-listing
2024/11/05 12:11:34 Info: ssh (/usr/bin/ssh): OpenSSH_9.7p1, LibreSSL 3.3.6
2024/11/05 12:11:34 Info: git (/opt/homebrew/bin/git): git version 2.46.0
2024/11/05 12:11:34 Info: git-lfs (/opt/homebrew/bin/git-lfs): git-lfs/3.5.1 (GitHub; darwin arm64; go 1.23.1)
2024/11/05 12:11:34 /opt/homebrew/bin/git -c safe.directory=/tmp/workspace/source clone -h
2024/11/05 12:11:34 /opt/homebrew/bin/git -c safe.directory=/tmp/workspace/source submodule -h
2024/11/05 12:11:34 /opt/homebrew/bin/git -c safe.directory=/tmp/workspace/source clone --quiet --no-tags --single-branch --depth 1 -- https://github.com/shipwright-io/sample-go /tmp/workspace/source
2024/11/05 12:11:35 /opt/homebrew/bin/git -c safe.directory=/tmp/workspace/source -C /tmp/workspace/source submodule update --init --recursive --depth 1
2024/11/05 12:11:35 /opt/homebrew/bin/git -c safe.directory=/tmp/workspace/source -C /tmp/workspace/source rev-parse --abbrev-ref HEAD
2024/11/05 12:11:35 Successfully loaded https://github.com/shipwright-io/sample-go (main) into /tmp/workspace/source
 drwxr-xr-x  3  501  0    96B  .github
 drwxr-xr-x  4  501  0   128B  .github/workflows
 -rw-r--r--  1  501  0   438B  .github/workflows/issues.yml
 -rw-r--r--  1  501  0   1.6K  .github/workflows/source-bundle-upload.yaml
 -rw-r--r--  1  501  0     5B  .shpignore
 -rw-r--r--  1  501  0  11.1K  LICENSE
 -rw-r--r--  1  501  0   291B  OWNERS
 -rw-r--r--  1  501  0   1.3K  README.md
 drwxr-xr-x  4  501  0   128B  docker-build
 -rw-r--r--  1  501  0   381B  docker-build/Dockerfile
 -rw-r--r--  1  501  0   972B  docker-build/main.go
 drwxr-xr-x  4  501  0   128B  docker-build-with-args
 -rw-r--r--  1  501  0   528B  docker-build-with-args/Dockerfile
 -rw-r--r--  1  501  0   972B  docker-build-with-args/main.go
 drwxr-xr-x  4  501  0   128B  source-build
 -rw-r--r--  1  501  0    35B  source-build/go.mod
 -rw-r--r--  1  501  0   972B  source-build/main.go
 drwxr-xr-x  4  501  0   128B  source-build-with-package
 -rw-r--r--  1  501  0    35B  source-build-with-package/go.mod
 drwxr-xr-x  3  501  0    96B  source-build-with-package/main-package
 -rw-r--r--  1  501  0   972B  source-build-with-package/main-package/main.go
──────────────────────────────────────────────────────────────────────────────
                        40.4K  45 files in .git
                        60.7K  66 files in total

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

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/kind cleanup

Release Notes

NONE

[qu1queee]

/lgtm

[SaschaSchwarze0]

Rebased to get the BuildKit fix to get e2e green.

[SaschaSchwarze0]

/approve
/lgtm

[openshift-ci]

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