Fixing qrc tech file read bug in

[vikramjain236]

Hammer flow breaks on the physical-aware design flow in genus because genus only allows one file to be read for the qrc_tech_file attribute. To fix this, we have set this to always read the first index. We have also set the default value of the phys_flow_effort key to be none, and let the users decide the setting in their yml inputs.
Related PRs / Issues

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• Change to core Hammer
• Change to a Hammer plugin
• Other

Contributor Checklist:

• Did you set master as the base branch?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you update the poetry.lock file if you updated the requirements in pyproject.toml?
• (If applicable) Did you add a unit test demonstrating the PR?
• (If applicable) Did you run this through the e2e integration tests?
• (If applicable) Did you update the submodules in e2e/ if this feature depends on updated plugins?