NC | Online Upgrade | RPM spec changes and github action for RPM install test

[romayalon]

Explain the changes

1. Instead of letting the RPM upgrade handle /usr/local/noobaa-core automatically, we first -
   a. copy the new source code to /usr/local/.noobaa-core-{new_version}/ hidden directory
   b. on the post section -
   i. move current version source code from /usr/local/noobaa-core/ to /usr/local/.noobaa-core-{current_version}/
   ii. move new version source code from /usr/local/.noobaa-core-{new_version}/ to /usr/local/noobaa-core/

This way we can ensure, untracked files added to the old noobaa-core source code dir are removed.

Issues: Fixed #xxx / Gap #xxx

Testing Instructions:

1. docker run --privileged --user root -d --platform=linux/amd64 oowy/redhat:ubi9
2. docker exec -it {container_id} bash
3. yum install wget
4. install boost-system and boost-thread

    wget https://rpmfind.net/linux/centos-stream/9-stream/AppStream/x86_64/os/Packages/boost-system-1.75.0-8.el9.x86_64.rpm
    wget https://rpmfind.net/linux/centos-stream/9-stream/AppStream/x86_64/os/Packages/boost-thread-1.75.0-8.el9.x86_64.rpm
    rpm -i boost-system-1.75.0-8.el9.x86_64.rpm
    rpm -i boost-thread-1.75.0-8.el9.x86_64.rpm

5. wget https://noobaa-core-rpms.s3.us-east-1.amazonaws.com/noobaa-core-5.16.0-20240403.el9.x86_64.rpm
6. rpm -i noobaa-core-5.16.0-20240403.el9.x86_64.rpm
7. mkdir /usr/local/noobaa-core/user-modified-dir/
8. echo "blblblalal" > /usr/local/noobaa-core/user_modified_dir/user_modified_file
9. wget https://noobaa-core-rpms.s3.us-east-1.amazonaws.com/${rpm having this PR changes}
10. rpm -Uvh {rpm having this PR changes}
11. check if /usr/local/noobaa-core still have user_modified_dir/user_modified_file
    and user_modified_dir/.

• Doc added/updated
• Tests added