Fix: Disable execute bit in git + correct shebangs (#27450)

# Fix: Execute bits in git and shebangs

Some files had the execute bit improperly set to enabled.
Some scripts did not have a correct shebang.

dev/tools/fixhasRights.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 #
 # Example of script to fix code writing of permissions
 #

dev/tools/github_commits_perversion.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 #
 # Count number of commits per user and per versions (using date for version detection)
 #

dev/tools/github_lines_perusers.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 #
 # Count number of lines modified per user for a given branch
 #