If metric query contains surrounding whitespace, then it's not trimmed and Graphite host returns 400 Bad Request

Simplest example of analysis template:

apiVersion: argoproj.io/v1alpha1
kind: ClusterAnalysisTemplate
metadata:
  name: error-rate
  namespace: argo-rollouts
spec:
  metrics:
    - name: error-rate
      failureLimit: 1
      # Note that the Argo Rollouts Graphite metrics provider returns result as an array of float64s with 6 decimal places.
      successCondition: 'len(result) > 0 and result[len(result)-1] < asFloat(10)'
      provider:
        graphite:
          address: https://some-graphite-host.com
          query: |
            from=-2&target=sumSeries(app.http.*.*.count)

When this is parsed from YAML, this query contains a newline in the end, so when it's "trimmed", it still contains a trailing space, so when put into the query, it becomes:

format=json&from=-2min&target=sumSeries%28app.http.%2A.%2A.count%29+

This leads to 400 Bad Request response from Graphite, example cURL command:

$ curl 'https://some-graphite-host.com/render?format=json&from=-2min&target=sumSeries%28app.http.%2A.%2A.count%29+'
Bad Request: Bad Request

Target              : sumSeries(app.http.*.*.count) 
Parsed so far       : sumSeries(app.http.*.*.count)
Could not parse     :  

Proposed solution: replace all whitespace in the query with an empty string.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
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