Fixed PRC not getting removed when modifying repositories

[hstct]

closes #1190

[quba42]

I only have some small suggestions. Even without the everything appears to work.

I manually tested the following:

workon pulp_cli
alias pulp='pulp -p oci-env'
NAME='package_removal_test'

alias http='http --auth admin:password '
PULP_URL='http://localhost:5001'

pulp status
http get ${PULP_URL}/pulp/api/v3/status/


pulp deb repository create --name="${NAME}"
pulp deb content upload --file='../neovim_0.3.4-3_amd64.deb' --distribution='my-dist' --component='my-component' --repository="${NAME}"
pulp deb content upload --file='../odin_1.0_ppc64.deb' --distribution='my-dist' --component='my-component' --repository="${NAME}"

pulp deb repository create --name="${NAME}2"
pulp deb content upload --file='../neovim_0.3.4-3_amd64.deb' --distribution='my-dist2' --component='my-component2' --repository="${NAME}2"

pulp deb publication create --repository=${NAME}
pulp deb distribution create --name=${NAME} --base-path=${NAME} --repository=${NAME}


REPOSITORY_HREF=$(pulp deb repository show --name=${NAME} | jq -r .pulp_href)
PACKAGE_HREF=$(pulp deb content show --sha256='e36dccccd1fd8e38086b15d81d9aef049bc0586dd9b540b171d6917e41268f61' | jq -r .pulp_href)
TASK_HREF=$(http post ${PULP_URL}${REPOSITORY_HREF}modify/ remove_content_units:=[\"${PACKAGE_HREF}\"] | jq -r .task)
pulp show --href=${TASK_HREF}

This ensures that PRCs that point to the same package, but are not part of the repo we are removing from are not a problem.

I also tested removing multiple packages in a single API call, which worked fine.

[quba42]

LGTM.

[patchback]

Backport to 3.2: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.2/5551dfef757ed204438fe9375080adc47280abdc/pr-1185

Backported as #1192

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.3: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.3/5551dfef757ed204438fe9375080adc47280abdc/pr-1185

Backported as #1193

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.4: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.4/5551dfef757ed204438fe9375080adc47280abdc/pr-1185

Backported as #1194

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.