Assert module exists in build.version.test.ts

[samayer12]

Describe what should be investigated or refactored

Files in integration/build.*.test.ts must build a unique pepr module so that the tests can run in parallel in CI and provide a faster feedback loop. build.version.test.ts (see #1642) captures current behavior of a bug reported in #1724 which conflicts with the Pepr docs.

This chore will be resolved with we can assert:

expect(existsSync(`${testModule}/dist`)).toBe(true);

and get a passing test.

Links to any relevant code

N/A

Additional context

Discovered in #1661.

[samayer12]

We intend to remove the npx pepr build --version flag as part of #1724. Closing this issue since the test will be removed when we deprecate the --version flag.