Remove metric MinMaxSumCount kind aggregation

[hanyuancheung]

Resolves #2401

• remove metric MinMaxSumCount kind aggregation.
• remove the corresponding OTLP export path.
• fix unittest and add changelog.

[codecov]

Codecov Report

Merging #2423 (582ad5e) into main (ee60bcc) will decrease coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #2423     +/-   ##
=======================================
- Coverage   75.5%   75.3%   -0.2%     
=======================================
  Files        174     173      -1     
  Lines      12113   11954    -159     
=======================================
- Hits        9147    9011    -136     
+ Misses      2717    2702     -15     
+ Partials     249     241      -8     

Impacted Files	Coverage Δ
...otlp/otlpmetric/internal/metrictransform/metric.go	78.1% <ø> (+0.2%)	⬆️
...tlp/otlpmetric/internal/otlpmetrictest/otlptest.go	0.0% <ø> (ø)
exporters/stdout/stdoutmetric/metric.go	81.9% <ø> (+5.6%)	⬆️
sdk/export/metric/aggregation/aggregation.go	0.0% <ø> (ø)
sdk/export/metric/metric.go	0.0% <ø> (ø)
sdk/metric/processor/processortest/test.go	84.1% <ø> (-0.5%)	⬇️
sdk/metric/selector/simple/simple.go	100.0% <100.0%> (ø)
sdk/metric/aggregator/aggregatortest/test.go	81.0% <0.0%> (-2.6%)	⬇️

[MrAlias]

This comment needs to be updated to not refer to the removed aggregation type,.