Fix default CLI project name mismatch in help text and README

[rquidute]

Summary

• The --project-id help text (th_cli/commands/run_tests.py) and README described the default project as 'CLI Execution Project', but the actual code constant (DEFAULT_CLI_PROJECT_NAME in th_cli/utils.py) is 'CLI Project Execution' — the words were transposed.
• Aligned both doc strings to match the code constant, since changing the constant itself would affect existing users' already-created projects.

Closes #1139

Test plan

• grep -rn "CLI Execution Project\|CLI Project Execution" confirms all three references now use 'CLI Project Execution'
• th_cli run-tests --help shows the corrected text

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