remove superseded lints

[bend-n]

changelog: [transmute_float_to_int, transmute_int_to_char, transmute_int_to_float]: remove lints, now in rustc

these lints are now mostly in rustc, so they dont need to be in clippy anymore

rust-lang/rust#136083 (comment)

[rustbot]

r? @llogiq

rustbot has assigned @llogiq.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[rustbot]

Failed to set assignee to lcnr: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

[Jarcho]

When uplifting lints please run cargo dev rename_lint <lint_name> <uplifted_name> --uplift. This will add all the metadata related to lint renames.