Remove duplicated get_val (lambdaclass#2065)

* avoid installing gmp if it is already installed

* revert part of the last commit

* changelog

* remove unwanted file

Author: FrancoGiachetta

CHANGELOG.md

@@ -17,6 +17,8 @@
 
 * refactor: remove duplicated get_val function [#2065](https://github.com/lambdaclass/cairo-vm/pull/2065)
 
+* refactor: remove duplicated get_val function [#2065](https://github.com/lambdaclass/cairo-vm/pull/2065)
+
 * fix: Always use a normal segment in first SegmentArena segment [#1845](https://github.com/lambdaclass/cairo-vm/pull/1845)
 
 * chore: update cairo-lang dependencies to 2.12.0-dev.0 #[2040](https://github.com/lambdaclass/cairo-vm/pull/2040)