[prometheus] Fix yAxis Values

[ricoberger]

• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml and the documentation for all values.

[codecov]

Codecov Report

Merging #580 (bcea1d0) into main (20e1aaf) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #580   +/-   ##
=======================================
  Coverage   70.72%   70.72%           
=======================================
  Files         388      388           
  Lines       60667    60667           
  Branches     2732     2732           
=======================================
  Hits        42905    42905           
  Misses      17493    17493           
  Partials      269      269           

Flag	Coverage Δ
go	71.39% <ø> (ø)
node-app	0.00% <ø> (ø)
node-azure	93.91% <ø> (ø)
node-core	42.07% <ø> (ø)
node-flux	65.99% <ø> (ø)
node-github	98.42% <ø> (ø)
node-grafana	89.65% <ø> (ø)
node-harbor	94.80% <ø> (ø)
node-helm	99.15% <ø> (ø)
node-jaeger	91.02% <ø> (ø)
node-jira	95.66% <ø> (ø)
node-kiali	89.88% <ø> (ø)
node-klogs	92.57% <ø> (ø)
node-mongodb	96.59% <ø> (ø)
node-opsgenie	86.59% <ø> (ø)
node-prometheus	88.15% <100.00%> (ø)
node-rss	96.16% <ø> (ø)
node-signalsciences	97.48% <ø> (ø)
node-sonarqube	96.12% <ø> (ø)
node-sql	88.75% <ø> (ø)
node-techdocs	94.77% <ø> (ø)

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Impacted Files	Coverage Δ
app/packages/prometheus/src/components/Chart.tsx	90.47% <100.00%> (ø)

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