Update docs to use go 1.24 tool dependencies instead of internal/tools.go pattern

[deitrix]

Resolves #3740

This PR aims to update the gqlgen documentation to use the new go tool dependency functionality introduced in Go 1.24, as opposed to the older internal/tools.go pattern.

Now, the recommended way to add tool dependencies is:

go get -tool github.com/99designs/gqlgen

These tools can then be ran directly using go tool. So, any occurrences of:

go run github.com/99designs/gqlgen

Have now been replaced with:

go tool gqlgen

Hopefully I caught them all!

[StevenACoffman]

Thanks! I marked it as draft just to mark it as "don't merge" until Go 1.25 is released, if that's ok?

[coveralls]

coverage: 0.0%. remained the same
when pulling 1535c94 on deitrix:tool-dependency-docs
into b7a335f on 99designs:master.

[deitrix]

Thanks! I marked it as draft just to mark it as "don't merge" until Go 1.25 is released, if that's ok?

Absolutely, no problem! 😄

[StevenACoffman]

@deitrix Do you mind freshening this up a bit?

[deitrix]

@StevenACoffman I've rebased the branch and given it a once over. All still looks good to me!