Don't re-use reaper if it failed to initialize

[kernle32dll]

If the reaper fails to initialize, it leaves testcontainers in a broken state. To be precise, the Endpoint variable is never properly initialized, which causes subsequent usages of testcontainers to fail with failed to create container: connecting to reaper failed: Connecting to Ryuk on failed: dial tcp: missing address.

[mdelapenya]

@kernle32dll are you still interested in this PR? If not, I'd like to label it as hacktoberfest in case anybody is willing to help here.

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[mdonkers]

With merging https://github.com/testcontainers/testcontainers-go/pull/782, I believe this PR became obsolete and can be closed?

[mdelapenya]

I believe so. I'm closing it but feel free to reopen if it persists, thanks!