Avoid name clashes with types from java.lang

[EgorkaKulikov]

Description

Currently we can resolve name clashes with everything that has already been imported.
But we can also obtain clashes with names from java.lang - it should be fixed

Fixes # (1716)

Type of Change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Manual Scenario

Run ContestEstimator with the following settings

methodFilter = "org.apache.pdfbox.rendering.PageDrawer.*"
projectFilter = listOf("pdfbox")

Checklist (remove irrelevant options):

• [+] The change followed the style guidelines of the UTBot project
• [+] Self-review of the code is passed
• [+] The change contains enough commentaries, particularly in hard-to-understand areas
• [+] No new warnings