Update utils_test to use require.Equal

The following discussion from !1432 (merged) should be addressed:

• @patrickbajao started a discussion:

  Can we utilize require.Equal here since we're already using require in this test file?

  			require.Equal(t, tt.want, filePathWanted, "SanitizePathName() got = %s, want = %s")

  This is going to be inconsistent with the rest of the file so I think we can have this as a follow up issue to refactor this entire file to utilize require package. So this is non-blocking.

Implementation plan

• Use assert.Equal or require.Equal instead of code like:

			if filePathWanted != tt.want {
				t.Errorf("SanitizePathName() got = %s, want = %s", filePathWanted, tt.want)
			}

• We could most likely use this everywhere since we're already using the require library.