[gitpython]: Move Fuzz Tests & Configuration Upstream (#11803)

Updates the gitpython project files to enable migrating and maintaining
fuzz targets and build scripts upstream.

Related PR in the upstream repo:
gitpython-developers/GitPython#1901

`project.yaml` updates:

- @Byron, the maintainer of GitPython, is added as the primary contact.
- @EliahKagan and myself are added to the `auto_ccs` list as discussed
with @Byron here:
gitpython-developers/GitPython#1889 (comment)
- @DavidKorczynski I removed what I believe is your email from the
`vendor_ccs` because it looked like you were included as the default
when no other contacts were listed. If this was a mistake on my part and
you want to remain listed as a CC, please let me know and I'll correct
it.

Thanks!

Author: DaveLak

Diff for: projects/gitpython/Dockerfile

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 # Copyright 2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,5 +13,7 @@
 # limitations under the License.
 FROM gcr.io/oss-fuzz-base/base-builder-python
 RUN git clone https://github.com/gitpython-developers/gitpython gitpython
-COPY *.sh *py $SRC/
+RUN $SRC/gitpython/fuzzing/oss-fuzz-scripts/container-environment-bootstrap.sh
+
+COPY *.sh $SRC/
 WORKDIR $SRC/gitpython

Diff for: projects/gitpython/build.sh

@@ -14,9 +14,5 @@
 # limitations under the License.
 #
 ################################################################################
-pip3 install .
 
-# Build fuzzers in $OUT.
-for fuzzer in $(find $SRC -name 'fuzz_*.py'); do
-  compile_python_fuzzer $fuzzer
-done
+. "$SRC/gitpython/fuzzing/oss-fuzz-scripts/build.sh"

Diff for: projects/gitpython/fuzz_config.py

@@ -1,10 +1,11 @@
-fuzzing_engines:
-- libfuzzer
-homepage: https://github.com/gitpython-developers/gitpython
+homepage: "https://github.com/gitpython-developers/gitpython"
 language: python
-main_repo: https://github.com/gitpython-developers/gitpython
+primary_contact: "[email protected]"
+auto_ccs:
+  - "[email protected]"
+  - "[email protected]"
+main_repo: "https://github.com/gitpython-developers/gitpython"
+fuzzing_engines:
+  - libfuzzer
 sanitizers:
-- address
-- undefined
-vendor_ccs:
-- [email protected]
+  - address