Changes include:
* Use Observable instead of metrics
* Update the setting of lowCardinalityTag to the correct events.
* Update the docs
* Remove EXTERNAL_EXECUTION_ID
* Utilize registry provided by boot instead of globalregistry
* Set the handler until Boot does this as shown on line 80 of TaskLifecycleConfiguration.
* Uses Observability long task timer
Updated to latest changes in Micrometer Observability
Updated based on code review and api change
Finished removing the metrics registry
Updated based on code review
Readded cloud foundry keys to observations
Renamed metrics to observations where applicable
Updated metric sample to be observation sample
Updated to set defaults and migrate tests to infrastructure
Updated based on code review
Remove duplicate keyvalues from task observation
Added DocumentedObservation to create the observation
Migrated code to use the LowerCardinality KeyNames from the DocumentedObservation
Test cleanup
Updated code based on code review
Exception is handled by the error in the observation vs logging it as a task metric key value
Updated to use ObservationConvention
Updated to handle user defined convention vs default
Removed the snapshot versions of observations
Removed unnecessary dependencies
Checkpoint tests fail after re-adding 1.10-SNAPSHOT
Replaced TimeObservationHandler with DefaultMeterObservationHandler
Updated to set micrometer to latest milestone
Updated to rename TaskValuesProvider variables to ObservationConvention
