TST: Create compressed salary testing data
Create compressed versions of the salary dataset for testing #14576.

Rename `salary.table.csv` to `salaries.tsv` because the dataset is tab rather than comma delimited. Remove the word table because it's implied by the extension. Rename `salary.table.gz` to `salaries.tsv.gz`, since compressed files should append to not strip the original extension.

Created new files by running the following commands:

```sh
cd pandas/io/tests/parser/data
bzip2 --keep salaries.tsv
xz --keep salaries.tsv
zip salaries.tsv.zip salaries.tsv
```

There will be CI testing failures since the modified files are not yet in master or on amazon S3. @jorisvandenbossche how do we deal with this?