[integ-tests-framework] When generating launch time and performance reports, separate the report according to instance type

[hanwen-cluster]

Description of changes

This commit makes the trend even clearer, because we won't be confused by sudden changes because we test some instance types (e.g. p6-b200) temporarily

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

Please review the guidelines for contributing and Pull Request Instructions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.