fix(sdk): build re-touches unused git_push.sh file

[petermetz]

Describe the bug

The SDK build touches the packages/cactus-sdk/src/main/typescript/generated/openapi/typescript-axios/git_push.sh file which then shows up in the git diffs despite the file contents being equal as before (maybe it changes the executable flag on the file?)

The second part of the problem is that we don't actually use/need/want this git_push.sh file at all since we have our own mechanisms in place for doing what that (otherwise handy little) script does for developers. So really the best would be to just ignore/exclude/delete that file altogether.

To Reproduce

npm run build or any of the lighter build tasks that still end up running the OpenAPI generator tool for the SDK.
Run git status and notice how the file was touched and that there is no real diff.

Expected behavior

The build should not touch files that are under version control, or if it does, there should be an actual change to propagate.

Operating system name, version, build:

Use this command: printf "$(uname -srm)\n$(cat /etc/os-release)\n"

Linux 5.4.0-39-generic x86_64
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

Hyperledger Cactus release version or commit (git rev-parse --short HEAD):

92e7b0b

Hyperledger Cactus Plugins/Connectors Used

Additional context

Fairly certain that the root cause is the OpenAPI generator doing something it should not (or something that is needed but we don't use it).

cc: @takeutak @jonathan-m-hamilton @sfuji822