Missing tests for some `component new` flags

[catamorphism]

I can't find any tests that exercise component new with the --realloc-via-memory-grow or --merge-imports-based-on-semver flags.

Context: I'm trying to write examples in the help text that illustrate various flags. My first step was to look for tests to see how they should be used.

[alexcrichton]

I don't think that there are dedicated tests for these flags right now unfortunately. They are used to control the default behavior of how a component is created where, for example, by default cabi_realloc is used to allocate memory but --realloc-via-memory-grow says "don't do that and instead use memory.grow". Similarly for --merge-imports-based-on-semver that turns off on-by-default behavior. These were added over time to tweak the default heuristics which is why the aren't super well tested.

The tests/cli directory has some files with --merge-world-imports-based-on-semver but none with --merge-world-imports-based-on-semver=false. The tests at crates/wit-component/tests/components test some various behaviors of reallocation but in general don't have a dedicated test for --realloc-via-memory-grow I believe.