fix(Activity Tracker): re-gen service after recent service name change

[yingwang-us]

PR summary

• service name is changed from activity tracking to activity tracker, therefore update apidoc as well as sdk
• update atracker GA api endpoints, for GA we only support us-east / us-south public and private endpoints

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Current vs new behavior

Does this PR introduce a breaking change?

• Yes
• No

Other information

[yingwang-us]

yings-mbp:atrackerv1 [email protected]$ go test
Running Suite: AtrackerV1 Suite
===============================
Random Seed: 1627940380
Will run 91 of 91 specs

•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Ran 91 of 91 Specs in 3.474 seconds
SUCCESS! -- 91 Passed | 0 Failed | 0 Pending | 0 Skipped
PASS
ok  	github.com/IBM/platform-services-go-sdk/atrackerv1	4.981s

[yingwang-us]

yings-mbp:platform-services-go-sdk [email protected]$ go test github.com/IBM/platform-services-go-sdk/atrackerv1 -tags="integration" -v
=== RUN   TestAtrackerV1
Running Suite: AtrackerV1 Suite
===============================
Random Seed: 1627939164
Will run 129 of 129 specs

Service URL: http://localhost:6969
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Ran 129 of 129 Specs in 11.779 seconds
SUCCESS! -- 129 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestAtrackerV1 (11.80s)
PASS
ok  	github.com/IBM/platform-services-go-sdk/atrackerv1	(cached)

[padamstx]

LGTM

[Andras-Csanyi]

LGTM

[ibm-devx-sdk]

🎉 This PR is included in version 0.19.3 🎉

The release is available on GitHub release

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