Use project-name in the project-kill-buffers prompt

This is mildly prettier (bug#66518).

* lisp/progmodes/project.el (project-kill-buffers): Use project-name.
10 jobs for master in 227 minutes and 54 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build Images
failed #75587
build-image-inotify

02:29:25

 
  Normal
skipped #75588
test-all-inotify
 
  Platform Images
failed #75589
build-image-eglot

02:24:12

failed #75591
build-image-gnustep

00:03:40

failed #75590
build-image-tree-sitter

02:24:09

 
  Platforms
skipped #75592
test-eglot
skipped #75594
test-gnustep
skipped #75593
test-tree-sitter
 
  Native Comp Images
passed #75595
build-native-comp-speed2

02:48:52

 
  Native Comp
passed #75596
test-native-comp-speed2

00:58:48

 
Name Stage Failure
failed
build-image-inotify Build Images
net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Running after_script
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-inotify-0d536f27: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
build-image-tree-sitter Platform Images
context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Running after_script
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-tree-sitter-0d536f27: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
build-image-eglot Platform Images
5f70bf18a086: Retrying in 7 seconds
5f70bf18a086: Retrying in 6 seconds
net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-eglot-0d536f27: No such file or directory
ERROR: Job failed: exit code 1
failed
build-image-gnustep Platform Images
$ docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Error response from daemon: Get "https://emba.gnu.org:5050/v2/": Get "https://emba.gnu.org//jwt/auth?account=gitlab-ci-token&client_id=docker&offline_token=true&service=container_registry": net/http: request canceled (Client.Timeout exceeded while awaiting headers) (Client.Timeout exceeded while awaiting headers)
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-gnustep-0d536f27: No such file or directory
ERROR: Job failed: exit code 1