fix(metrics-operator): improve error handling in metrics providers

[RealAnna]

This pr:

1. handles hidden error in the response of metrics providers
2. adds trim of queries from dt provider so that spaces and new lines are allowed.
3. in case error may not be clear returns the raw value of the provider response

How to test:

1. pass a wrong token, API returns error that is logged and stored in the KeptnMetrics ex

Status: Err Msg: provider api response: Token Authentication failed

2. use a metric like so or change >- with | :

apiVersion: metrics.keptn.sh/v1alpha3
kind: KeptnMetric
metadata:
  name: podtatometric
  namespace: keptn-lifecycle-toolkit-system
spec:
  provider:
    name: "dynatrace"
  query:  >-
    (( builtin:kubernetes.workload.cpu_throttled
    :filter(eq("k8s.workload.name","frontend"))
    :splitBy("k8s.namespace.name","k8s.workload.kind","k8s.workload.name") :sum
    / builtin:kubernetes.workload.cpu_usage
    :filter(eq("k8s.deployment.name","frontend"))
    :splitBy("k8s.namespace.name","k8s.workload.kind","k8s.workload.name") :sum
    ) :default(0.0) * 100.0)
  fetchIntervalSeconds: 5

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[codecov]

Codecov Report

Merging #1466 (dcfa283) into main (30e6647) will increase coverage by 1.44%.
The diff coverage is 96.66%.

❗ Current head dcfa283 differs from pull request most recent head afce712. Consider uploading reports for the commit afce712 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1466      +/-   ##
==========================================
+ Coverage   61.62%   63.06%   +1.44%     
==========================================
  Files         137      139       +2     
  Lines       10456    10834     +378     
==========================================
+ Hits         6444     6833     +389     
+ Misses       3762     3745      -17     
- Partials      250      256       +6     

Impacted Files	Coverage Δ
...r/controllers/common/providers/dynatrace/common.go	100.00% <ø> (ø)
...or/controllers/common/providers/datadog/datadog.go	78.57% <85.71%> (+1.64%)	⬆️
...ontrollers/common/providers/dynatrace/dynatrace.go	84.50% <100.00%> (+2.84%)	⬆️
...ollers/common/providers/dynatrace/dynatrace_dql.go	79.33% <100.00%> (+3.47%)	⬆️
metrics-operator/controllers/metrics/controller.go	67.64% <100.00%> (+1.49%)	⬆️

... and 15 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	68.55% <ø> (ø)
component-tests	59.82% <ø> (+0.57%)	⬆️
lifecycle-operator	84.06% <ø> (+0.68%)	⬆️
metrics-operator	81.73% <96.66%> (+1.22%)	⬆️
scheduler	30.45% <ø> (+8.69%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication