Revert "[test] Add is_cfi variable for test status files"

This reverts commit f0c9e932.

Reason for revert: Suspicion of breaking infra somehow

Original change's description:
> [test] Add is_cfi variable for test status files
> 
> Bug: v8:10640
> Change-Id: Ifa485c285f345ca1ffba949feb8fc70b160a018c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2264627
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#68523}

TBR=machenbach@chromium.org,syg@chromium.org

Change-Id: I9a71ac443d64d2e8121f6a7ea52af833bb8add36
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10640
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2264953Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68527}

tools/testrunner/base_runner.py

@@ -676,7 +676,6 @@ class BaseTestRunner(object):
       "arch": self.build_config.arch,
       "asan": self.build_config.asan,
       "byteorder": sys.byteorder,
-      "cfi_vptr": self.build_config.cfi_vptr,
       "dcheck_always_on": self.build_config.dcheck_always_on,
       "deopt_fuzzer": False,
       "endurance_fuzzer": False,