[SREP-3734] Remove AlertmanagerInhibitions test (moved to CAMO)

[smarthall]

Summary

• Removes the AlertmanagerInhibitions test from pkg/e2e/osd/inhibitions.go — this test has been moved to the configure-alertmanager-operator repo's e2e suite
• Cleans up the now-unused github.com/prometheus/alertmanager dependency and 6 transitive-only deps via go mod tidy

Test plan

• go build ./... passes
• go mod tidy produces no further changes

Related

The corresponding CAMO test addition: openshift/configure-alertmanager-operator#515

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[smarthall]

/hold Pending merge of openshift/configure-alertmanager-operator#515

[ritmun]

/lgtm
/approve
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[openshift-ci]

@ritmun: Overrode contexts on behalf of ritmun: ci/prow/hypershift-pr-check

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[smarthall]

Rebased against main branch to resolve go dependency file conflicts.

[smarthall]

/unhold

[ritmun]

/lgtm
/approve
/override ci/prow/hypershift-pr-check

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ritmun, smarthall

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[openshift-ci]

@ritmun: Overrode contexts on behalf of ritmun: ci/prow/hypershift-pr-check

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In response to this:

/lgtm
/approve
/override ci/prow/hypershift-pr-check

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[openshift-ci]

@smarthall: all tests passed!

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