Chore: delete useless files

[kakaZhou719]

Describe what this PR does / why we need it

For some historical reasons, we left those useless files which are deleted will not affect sealer stable.

1. some shell scripts file which is already replaced by the E2E test.
2. some useless file under hack dir.
3. some cert file that is no need to keep it in sealer. those certificate file will be generated every time at sealer run process on the server;

Does this pull request fix one issue?

Describe how you did it

Describe how to verify it

Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #1587 (f1a92b1) into main (08df4e0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1587   +/-   ##
=======================================
  Coverage   11.19%   11.19%           
=======================================
  Files          88       88           
  Lines        8067     8067           
=======================================
  Hits          903      903           
  Misses       7052     7052           
  Partials      112      112           

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[allencloud]

@bxy4543 @VinceCui Please take a look at this. I would like to double check and move on.

[bxy4543]

/lgtm