Component fails to retrieve collector rules for logging >= release-5.5

[anothertobi]

When configuring the component to retrieve alert rules for release-5.5 or later, compiling the component fails.

This happens because the upstream rules were moved from https://raw.githubusercontent.com/openshift/cluster-logging-operator/${openshift4_logging:alerts}/files/fluentd/fluentd_prometheus_alerts.yaml to https://raw.githubusercontent.com/openshift/cluster-logging-operator/${openshift4_logging:alerts}/files/collector/fluentd_prometheus_alerts.yaml for release-5.5 and later (file moved to different folder).

Steps to Reproduce the Problem

1. Set openshift4_logging.alerts: "release-5.4"
2. Compile -> works
3. Set openshift4_logging.alerts: "release-5.5"
4. Compile -> fails

Actual Behavior

Unknown (Non-Kapitan) Error occurred
multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
                    ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/kapitan/dependency_manager/base.py", line 159, in fetch_http_dependency
    content_type = fetch_http_source(source, cached_source_path, item_type)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/kapitan/dependency_manager/base.py", line 207, in fetch_http_source
    content, content_type = make_request(source)
                            ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/kapitan/utils.py", line 478, in make_request
    r.raise_for_status()
  File "/usr/local/lib/python3.11/site-packages/requests/models.py", line 953, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://raw.githubusercontent.com/openshift/cluster-logging-operator/master/files/fluentd/fluentd_prometheus_alerts.yaml
"""
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/kapitan/targets.py", line 113, in compile_targets
    fetch_dependencies(
  File "/usr/local/lib/python3.11/site-packages/kapitan/dependency_manager/base.py", line 88, in fetch_dependencies
    [p.get() for p in pool.imap_unordered(http_worker, http_deps.items()) if p]
  File "/usr/local/lib/python3.11/site-packages/kapitan/dependency_manager/base.py", line 88, in <listcomp>
    [p.get() for p in pool.imap_unordered(http_worker, http_deps.items()) if p]
  File "/usr/local/lib/python3.11/multiprocessing/pool.py", line 873, in next
    raise value
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://raw.githubusercontent.com/openshift/cluster-logging-operator/master/files/fluentd/fluentd_prometheus_alerts.yaml
404 Client Error: Not Found for url: https://raw.githubusercontent.com/openshift/cluster-logging-operator/master/files/fluentd/fluentd_prometheus_alerts.yaml

Expected Behavior

Successful compile

[anothertobi]

The upstream component is actively changing the way they manage the Prometheus rules.

On the release-5.5 branch the file was moved from files/fluentd/fluentd_prometheus_alerts.yaml to files/collector/fluentd_prometheus_alerts.yaml as part of openshift/cluster-logging-operator#1726 and on master the rules have been moved again, but this time into a go constant: openshift/cluster-logging-operator#1732

[simu]

Additionally, since we switched to using a Git commit ID as the default value for the alerts parameter, we can't implement the usual lookup map indexed by release as a quickfix. As I noted in #47, we'll have to completely reconsider how we want to manage logging collector alerts going forward.

[simu]

We'll handle the change to having the alert rules as a Go constant in #74, it's not immediately relevant for OpenShift logging release 5.5.