fix(optimizer): limit bundled file name length to 170 characters

[chaejunlee]

Description

closes #14542

I limited the dependent file name to 170 characters. Preserving first 159 161 characters followed by an underscore and first 10 8 characters of its hash, i.e. "very/long/filenameeee...e_abcde12345" "very/long/filenameeee...e_abcd1234".

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[chaejunlee]

The filename errors in windows system. Should I just make the filename shorter? I didn't because I thought it would just ruin the purpose of this fix.

I made the "longfilename/aa...aa/aa...aa" file 181 characters. I suits the purpose of this fix and does not cause error on windows environment.

[chaejunlee]

I added a test that actually checks the length of the file name. And I added the unit test to flattenId() as well!

[bluwy]

Nice and clean!