Improve automated pull requests

The automated workflow of this project includes opening automated PRs in case a new Qiskit version is found. The automated PR adds new csv results for experiments on new Qiskit versions. This job would benefit from improvements as listed below:

• include automation keyword in the PR title
• add qiskit version update in the PR description or commit message (eg. from qiskit vx to qiskit vy)
• don't add tox.ini file changes (tox configs are dynamically created for specific qiskit versions)
• summary.json still needs to be manually cleaned up (eg. replace summary results from qiskit version x.y.z1 with latest patch x.y.z2)