Remove CodeCov badge

[mconcas]

Reported number is obsolete and the status page says repository has been disabled.
Either we resume codecov or we should also remove the codecov.yml

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1

[alibuild]

Error while checking build/O2/fullCI_slc9 for 3b415df at 2025-02-12 19:15:

++ cp /sw/slc9_x86-64/O2/13960-slc9_x86-64-local1/compile_commands.json .
+++ python3 -c 'import json, os; print(os.path.commonprefix([x["file"] for x in json.loads(open("compile_commands.json").read()) if "sw/BUILD" not in x["file"] and "G__" not in x["file"] and x["file"].endswith(".cxx")]))'
++ O2_SRC=/sw/SOURCES/O2/13960-slc9_x86-64/0/
++ [[ -e /sw/SOURCES/O2/13960-slc9_x86-64/0//CMakeLists.txt ]]

Full log here.