Boinc client doesn't have protection against accidental running multiple instances on sam,e datadir

[kotenok2000]

Describe the bug
Boinc client doesn't have protection against accidental running multiple instances with same datadir
Steps To Reproduce

1. Install https://boinc.berkeley.edu/dl/boinc_ubuntu_7.16.6_x86_64-pc-linux-gnu.sh
2. replace files with files from https://boinc.berkeley.edu/dl/linux/stable/jammy/pool/main/b/boinc-client/boinc-client_8.0.2-715_amd64.deb and https://boinc.berkeley.edu/dl/linux/stable/jammy/pool/main/b/boinc-manager/boinc-manager_8.0.2-715_amd64.deb
3. run it with ./run_client
4. switch to a new terminal.
5. run it again with ./run_client
   Expected behavior
   Boinc client detects it is already running with same datadir and closes
   Screenshots
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System Information

• OS: Ubuntu 22.04
• BOINC Version: boinc-client_8.0.2-715

Additional context
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