[DistGB] save as graphbolt graph directly after partition

[CfromBU]

Simplify the graphbolt graph generation process, now we no longer need to save the DGLGraph to generate the FusedCSCSamplingGraph in partition process

[dgl-bot]

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

[dgl-bot]

Commit ID: 589f45c6eb7a5dde89105b710f39d8d268696c71

Build ID: 1

Status: ❌ CI test failed in Stage [Lint Check].

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Full logs path: link

[dgl-bot]

Commit ID: 4fc54fd804644fa0e2053708307d1a51f5bb0fc8

Build ID: 2

Status: ❌ CI test failed in Stage [Lint Check].

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[dgl-bot]

Commit ID: f051c87ea4703e2f8c2e825ddeb13db9af9626f2

Build ID: 3

Status: ❌ CI test failed in Stage [Lint Check].

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Full logs path: link

[dgl-bot]

Commit ID: 087c99e2480a8977b54cf91bf13de47297e3079e

Build ID: 4

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 63c4de9fccdc7800ef4c3129bf4f41eaa24e1dd0

Build ID: 5

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 54525fa4104fc5cdc67df0819628c0d99d0caa8f

Build ID: 6

Status: ❌ CI test failed in Stage [Torch CPU Unit test].

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[dgl-bot]

Commit ID: 9d4f778be278681d7704d5913894c7a580768627

Build ID: 7

Status: ❌ CI test failed in Stage [Lint Check].

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[dgl-bot]

Commit ID: 2979ffdc1c1a9276dbe01221d36c05dd7b6da386

Build ID: 8

Status: ❌ CI test failed in Stage [Distributed Torch CPU Unit test].

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Full logs path: link

[dgl-bot]

Commit ID: fc462f639c0fa0ea0f187229db3bed374c14d47d

Build ID: 9

Status: ❌ CI test failed in Stage [Lint Check].

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[Rhett-Ying]

if this pR is ready for review. please add me into the reviewer.

[dgl-bot]

Commit ID: c5e8e10339645ccca53bb95a4ca477c5abca6682

Build ID: 10

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 5d66e2e

Build ID: 11

Status: ❌ CI test failed in Stage [Distributed Torch CPU Unit test].

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Full logs path: link

[dgl-bot]

Commit ID: 2f23bd8a017acb26fb14f62cbc661dc1deb4ec4e

Build ID: 17

Status: ❌ CI test failed in Stage [Distributed Torch CPU Unit test].

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Full logs path: link

[dgl-bot]

Commit ID: 8170ab610da82ecd04cd4fd2571a0f4a879e4c67

Build ID: 18

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: b7b6fdaa24a6585aad377c331639440f6978e46c

Build ID: 19

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: b65b9438037cef817eedaff2e6aaac7fac71219d

Build ID: 20

Status: ❌ CI test failed in Stage [Lint Check].

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[dgl-bot]

Commit ID: 6a888c2b959608dd12a3606598790b45408ba695

Build ID: 21

Status: ❌ CI test failed in Stage [Lint Check].

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[dgl-bot]

Commit ID: 37922c4eb01cd9f1c7197b8e9c15bc36837e51c7

Build ID: 22

Status: ❌ CI test failed in Stage [Lint Check].

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[dgl-bot]

Commit ID: 3dac145c7e61f53b333c453b44af7d5e21cf27fa

Build ID: 23

Status: ❌ CI test failed in Stage [Lint Check].

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[CfromBU]

order:
#7724 partition test case
#7727 partition
#7728 dist partition
#7690 dist partition test case

[dgl-bot]

Commit ID: 3ed4756098cc3c2a068732621257d3880c586c21

Build ID: 24

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 59038c0a6e9f54cd983157da49ca84d797e02ae8

Build ID: 25

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: dac0c4290329e1f779d0af9ab2fc5db370afeba3

Build ID: 26

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 4076dda260d64435f68dd3786c27d4cc01c74cbc

Build ID: 27

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 57e24271e4a12bc6dbc194be2cd1d103fd098383

Build ID: 28

Status: ✅ CI test succeeded.

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