*: rename repo from pingcap/ticdc to pingcap/tiflow

[amyangfei]

What problem does this PR solve?

Finish step-3 in #3749

What is changed and how it works?

Run the following script

sed -i "s/github.com\/pingcap\/ticdc/github.com\/pingcap\/tiflow/g" $(find . -type f|grep -vE "bin/|.git")
sed -i "s/pingcap\/ticdc/pingcap\/tiflow/g" $(find . -type f|grep -vE "bin/|.git")
make fmt

Check List

Tests

• Unit test
• Integration test

Release note

None

[ti-chi-bot]

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[amyangfei]

/run-all-tests

[amyangfei]

/run-leak-test

[amyangfei]

/run-all-tests

[ti-chi-bot]

@amyangfei: PR needs rebase.

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