chore: Add licenses to packages (#18006)

* chore: Add licenses to packages

And also update deny.toml to flag any incompatible licenses we accidentally include.

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Spelling

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Copy additional files into rpm build directory

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Create parent directory

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Fix copying of files

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Note extra files for rpm

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

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Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>