[DistGB] save as graphbolt graph directly after partition test case

[CfromBU]

modify the test_partiton.py

[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: 49747cd56b92054f1b17945902b1566817fbec66

Build ID: 1

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

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[dgl-bot]

Commit ID: 4ee04fa00a60184b05a5321afac54b1a86f334c9

Build ID: 2

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

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[dgl-bot]

Commit ID: a9df022f6574b1fc6b19487a5d769912d758510b

Build ID: 3

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

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[dgl-bot]

Commit ID: 39d90c5f163c48feba94813244fccda0d2ed1e75

Build ID: 4

Status: ✅ CI test succeeded.

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[CfromBU]

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

[dgl-bot]

Commit ID: 2ec778a3fcb7fc25c3d87f27f66d5ed9b3a17985

Build ID: 5

Status: ✅ CI test succeeded.

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[CfromBU]

I modified the function in test case that relevant to graphbolt, but didn't change the function about DGLGraph.

[dgl-bot]

Commit ID: abc8c808f0ee4dbbb7692b54dcbd5ec764393fcb

Build ID: 6

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

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[dgl-bot]

Commit ID: 3ff5f7f2566d9419187d4a0d1eeef3086f9643e5

Build ID: 7

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 2c5e59919ac8a26b2c85fc73be53cc8acddb23c4

Build ID: 8

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: b8f2fd44a6ff4c6b28cec7d4a90a21a13c979b5a

Build ID: 9

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 285e0725f7bcdc771f4485528bc833affffdf9b1

Build ID: 11

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 2080927e5fda1642b636b2962a770c4691a61921

Build ID: 12

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[dgl-bot]

Commit ID: 80aa7ebb70957e7a7784ba1789d64d8d770891db

Build ID: 13

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[dgl-bot]

Commit ID: 590ae6b77467c36a2a67b10412e7f6762bd866a4

Build ID: 14

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Commit ID: f504cbb4feb38efc2b4ddcdf956ecf5a3e7e055c

Build ID: 15

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[dgl-bot]

Commit ID: 4e65f093bf4c1327052871a6f8e2d598376a48eb

Build ID: 16

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 8408d7267e66813765527bd46989cd07873d91ad

Build ID: 17

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[dgl-bot]

Commit ID: 2be6fceebda4dede472f7f80eec33c5b580832dc

Build ID: 18

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: f5222232155ffae371d818c1ab13dca67fb134af

Build ID: 19

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[dgl-bot]

Commit ID: eb93312bfcf77425d894b29492934fb65d839820

Build ID: 20

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 6f2b8d52cede9a75e41bbe000e6715cd6ef547cb

Build ID: 21

Status: ✅ CI test succeeded.

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