#1976 Too slow monomer library load

[AliaksandrDziarkach]

Update emsdk version. Fix code to check prefix instead of search word. Add UT

Generic request

• [ ] PR name follows the pattern #1234 – issue name
• [ ] branch name does not contain '#'
• [ ] base branch (master or release/xx) is correct
• [ ] PR is linked with the issue
• [ ] task status changed to "Code review"
• [ ] code follows product standards
• [ ] regression tests updated