Rollup merge of #99474 - aDotInTheVoid:rustdoc-json-noinline-test-cleanup, r=CraftSpider

Rustdoc json tests: New @hasexact test command

Alot of the time, we wanted to assert that a module had an exact set of items. Most of the time this was done by asserting that the ```@count``` of the module was `n`, and then doing `n` ```@has``` checks on the module.

This was tedious, so often shortcuts were done.

This PR adds a new command to jsondocck to allow consistently expressing this behavior, and then uses it to clean up the tests.

``@rustbot`` modify labels: +A-rustdoc-json +A-testsuite

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