Brage Ingebrigtsen 075535f869
remove --not flag for 'str contains' (#12837)
# Description
This PR resolves an inconsistency between different `str` subcommands,
notably `str contains`, `str starts-with` and `str ends-with`. Only the
`str contains` command has the `--not` flag and a desicion was made in
this #12781 PR to remove the `--not` flag and use the `not` operator
instead.

Before:
`"blob" | str contains --not o`
After:
`not ("blob" | str contains o)` OR `"blob" | str contains o | not $in`

> Note, you can currently do all three, but the first will be broken
after this PR is merged.

# User-Facing Changes
- remove `--not(-n)` flag from `str contains` command
  - This is a breaking change!

# Tests + Formatting
- [x] Added tests
- [x] Ran `cargo fmt --all`
- [x] Ran `cargo clippy --workspace -- -D warnings -D
clippy::unwrap_used`
- [x] Ran `cargo test --workspace`
- [ ] Ran `cargo run -- -c "use std testing; testing run-tests --path
crates/nu-std"`
    - I was unable to get this working.
```
Error: nu::parser::export_not_found

  × Export not found.
   ╭─[source:1:9]
 1 │ use std testing; testing run-tests --path crates/nu-std
   ·         ───┬───
   ·            ╰── could not find imports
   ╰────
```
^ I still can't figure out how to make this work 😂 

# After Submitting
Requires update of documentation
2024-05-11 23:13:36 +00:00
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