dgl [GraphBolt] Update `to_pyg_data()` to support get batch

Description

Update to_pyg_data() in MiniBatch to support get batch_size from seeds.

Please feel free to remove inapplicable items for your PR.

[ ] The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
[ ] I've leverage the tools to beautify the python and c++ code.
[ ] The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
[ ] All changes have test coverage
[ ] Code is well-documented
[ ] To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
[ ] Related issue is referred in this PR
[ ] If the PR is for a new model/paper, I've updated the example index here.

Mar 14 '24 07:03 yxy235

To trigger regression tests:

@dgl-bot run [instance-type] [which tests] [compare-with-branch]; For example: @dgl-bot run g4dn.4xlarge all dmlc/master or @dgl-bot run c5.9xlarge kernel,api dmlc/master

Mar 14 '24 07:03 dgl-bot

Commit ID: f92d84501a9cabcc2f63440d10800ab3c2bc326f

Build ID: 1

Status: ✅ CI test succeeded.

Report path: link

Full logs path: link

Mar 14 '24 08:03 dgl-bot

Commit ID: a53e19e392aff9c1cdff98905239eb03b8f47299

Build ID: 2

Status: ✅ CI test succeeded.

Report path: link

Full logs path: link

Mar 18 '24 06:03 dgl-bot