[Backport 2.9] - Fix reference to tsc binary when publishing shell

[jordojordo]

Summary

Fixes #12187

The node_modules/.bin is no longer accessible due to a typo within the BASE_DIR variable

Occurred changes and/or fixed issues

• Replaced the single & with a double && in both publish-shell.sh and typegen.sh scripts
• Added pipefail to publish-shell script to ensure it will exit when a command has an error

Technical notes summary

Using a single ampersand & instead of a double ampersand && will run the preceding command in the background rather than sequentially.

Areas or cases that should be tested

• Publishing of shell packages

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
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• The PR template has been filled out
• The PR has been self reviewed
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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
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[aalves08]

LGTM