add service_to_service_enabled field to atracker event streams endpoint

[helenxu1221]

What has been done?

Add service to service authentication for atracker to message hub through the new boolean field service_to_service_enabled in atracker event streams endpoint.

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'
Helens-IBM:terraform-provider-ibm.helenxu1221 helenxu$ make fmt && make testacc TEST=./ibm/service/atracker TESTARGS='-run=TestAccIBMAtracker.*' gofmt -w $(find .  -path ./.direnv -prune -false -o -name '*.go' |grep -v vendor)
gofmt -w $(find .  -path ./.direnv -prune -false -o -name '*.go' |grep -v vendor)
make: Entering directory `/Users/helenxu/go/src/github.com/IBM-Cloud/terraform-provider-ibm.helenxu1221'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm/service/atracker -v -run=TestAccIBMAtracker.* -timeout 700m
[WARN] Set the environment variable IBM_PROJECTS_CONFIG_APIKEY for testing IBM Projects Config resources, the tests will fail if this is not set
[WARN] Set the environment variable IBM_APPID_TENANT_ID for testing AppID resources, AppID tests will fail if this is not set
[WARN] Set the environment variable IBM_APPID_TEST_USER_EMAIL for testing AppID user resources, the tests will fail if this is not set
...
=== RUN   TestAccIBMAtrackerRoutesDataSourceBasic
--- PASS: TestAccIBMAtrackerRoutesDataSourceBasic (19.10s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceBasic
--- PASS: TestAccIBMAtrackerTargetsDataSourceBasic (15.46s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceAllArgs
--- PASS: TestAccIBMAtrackerTargetsDataSourceAllArgs (16.70s)
=== RUN   TestAccIBMAtrackerRouteBasic
--- PASS: TestAccIBMAtrackerRouteBasic (28.16s)
=== RUN   TestAccIBMAtrackerRouteBasicMultipleRules
--- PASS: TestAccIBMAtrackerRouteBasicMultipleRules (28.08s)
=== RUN   TestAccIBMAtrackerSettingsBasic
--- PASS: TestAccIBMAtrackerSettingsBasic (16.07s)
=== RUN   TestAccIBMAtrackerTargetBasic
--- PASS: TestAccIBMAtrackerTargetBasic (29.82s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/atracker	155.104s
make: *** No rule to make target `gofmt'.  Stop.
make: Leaving directory `/Users/helenxu/go/src/github.com/IBM-Cloud/terraform-provider-ibm.helenxu1221'

[hkantare]

what is update behavior for this attribute changing the value after initial creation

[helenxu1221]

user can switch between plain text password and service to service authentication. update to service_to_service_enabled cloud turn service to service authentication on or off.