test(sample/10): add e2e tests for fastify sample

[mahmoodhamdi]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe: Adding missing e2e tests

What is the current behavior?

The sample/10-fastify application has no e2e tests. The test:e2e script in package.json outputs "No e2e tests implemented yet."

What is the new behavior?

Added an e2e test for the Fastify platform sample that verifies:

• GET /cats returns all cats wrapped by the global TransformInterceptor in the { data: [...] } format
• The test uses FastifyAdapter matching the sample's runtime configuration
• CatsService is overridden with a mock to isolate the test from data persistence

Also updated the test:e2e script to use the jest configuration.

Does this PR introduce a breaking change?

• Yes
• No

[coveralls]

Pull Request Test Coverage Report for Build 7f7c9e5f-f7d6-440c-af10-5840e83701e6

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.841%

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Totals
Change from base Build d8b80ff4-1c32-4569-a75c-00480f0069ab:	0.0%
Covered Lines:	7473
Relevant Lines:	8318

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💛 - Coveralls

[kamilmysliwiec]

#16391