Add 5m timeout to bundle-test and make the computed catalog version stable

[wallrj]

While testing #105 I notice that the GitHub Action keeps running long after it is clear that the installation check has shown failures.

0s          Warning   BackOff               pod/cert-manager-webhook-6988db7859-fk5h5        Back-off restarting failed container cert-manager-webhook in pod cert-manager-webhook-6988db7859-fk5h5_operators(077cf6d9-b53b-48b7-bb18-da0b25eca027)
0s          Warning   BackOff               pod/cert-manager-webhook-6988db7859-fk5h5        Back-off restarting failed container cert-manager-webhook in pod cert-manager-webhook-6988db7859-fk5h5_operators(077cf6d9-b53b-48b7-bb18-da0b25eca027)
0s          Warning   BackOff               pod/cert-manager-webhook-6988db7859-fk5h5        Back-off restarting failed container cert-manager-webhook in pod cert-manager-webhook-6988db7859-fk5h5_operators(077cf6d9-b53b-48b7-bb18-da0b25eca027)
0s          Normal    Pulled                pod/cert-manager-webhook-6988db7859-fk5h5        Container image "quay.io/jetstack/cert-manager-webhook:v1.14.1" already present on machine
0s          Normal    Created               pod/cert-manager-webhook-6988db7859-fk5h5        Created container cert-manager-webhook
0s          Normal    Started               pod/cert-manager-webhook-6988db7859-fk5h5        Started container cert-manager-webhook
0s          Warning   BackOff               pod/cert-manager-webhook-6988db7859-fk5h5        Back-off restarting failed container cert-manager-webhook in pod cert-manager-webhook-6988db7859-fk5h5_operators(077cf6d9-b53b-48b7-bb18-da0b25eca027)
Error: The operation was canceled.

https://github.com/cert-manager/cert-manager-olm/actions/runs/7813016364/job/21311278187?pr=105

I also noticed that when I ran make bundle-test locally, and continued editing the files while the test was ongoing,
the computed catalog version changed between the running of an early make rule and a later make rule.
So I compute that version once when the makefile is parsed and use that as the default for all rules.

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[wallrj]

/lgtm

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