feat(metrics-operator): adapt to changes in DQL API

[bacherfl]

This PR adapts the DQL provider to be compatible with the latest version of the Dynatrace DQL API

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1948 (1146e79) into main (39db23e) will increase coverage by 1.21%.
Report is 4 commits behind head on main.
The diff coverage is 89.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1948      +/-   ##
==========================================
+ Coverage   84.08%   85.29%   +1.21%     
==========================================
  Files         141      129      -12     
  Lines        8702     8155     -547     
==========================================
- Hits         7317     6956     -361     
+ Misses       1127      986     -141     
+ Partials      258      213      -45     

Files Changed	Coverage Δ
...ollers/common/providers/dynatrace/client/common.go	66.66% <0.00%> (ø)
...ollers/common/providers/dynatrace/dynatrace_dql.go	80.75% <91.11%> (-2.22%)	⬇️
...r/controllers/common/providers/dynatrace/common.go	100.00% <100.00%> (ø)

... and 18 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	?
lifecycle-operator	84.92% <ø> (ø)
metrics-operator	85.40% <89.58%> (-0.63%)	⬇️
scheduler	32.12% <ø> (ø)

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