Remove most doxygen file-level commands, copyrights, and authors

Remove the \file directive, as it is always superfluous  because the
current file is implicit [1]:

> If the file name is omitted (i.e. the line after \file is left blank)
> then the documentation block that contains the \file command will belong
> to the file it is located in.

Author names and e-mails are not relevant for us: it can always be
inferred from git blame, and is often outdated.

Eurecom code has been contributed and was under OAI PL v1.0/v1.1.

For the cpack package contact: put generic email address that is
independent of an individual and that will remain reachable.

[1] https://www.doxygen.nl/manual/commands.html#cmdfile

openair2/F1AP/tests/f1ap_lib_test.c

@@ -19,15 +19,6 @@
  *      contact@openairinterface.org
  */
 
-/*! \file f1ap_lib_test.c
- * \brief Test functions for F1AP encoding/decoding library
- * \author Guido Casati, Robert Schmidt
- * \date 2024
- * \version 0.1
- * \note
- * \warning
- */
-
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>