Fix gh project completion drift

[codeforester]

Summary

• add the missing basectl gh project configure completion options for --config and --copy-fields-from
• add the missing basectl gh project issue set-fields completion option for --config
• update the completion regression test to match the documented Project command help

Fixes #1487.

Validation

• Red: env BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats cli/bash/commands/basectl/tests/completions.bats failed on the missing gh_project_configure_options assertion before the production change
• env BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats cli/bash/commands/basectl/tests/completions.bats
• env BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats cli/bash/commands/basectl/tests/gh.bats
• bash -n lib/shell/completions/basectl_completion.sh cli/bash/commands/basectl/tests/completions.bats
• shellcheck -S warning lib/shell/completions/basectl_completion.sh
• git diff --check
• env -u BASE_HOME BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash BASE_CACHE_DIR=/private/tmp/base-pr-train-1487 ./bin/base-test