Silence stream_get_contents() warnings in TestCaseClass.tpl and TestCaseMethod.tpl

[sanmai]

Although this problem is typically seen with PHPDBG, as per #3965, and not with regular PHP, it is not PHPDBG specific:

php -r 'stream_get_contents(STDOUT);' | cat

Will output the same error on PHP 7.4.11:

PHP Notice:  stream_get_contents(): read of 8192 bytes failed with errno=9 Bad file descriptor in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
PHP   2. stream_get_contents() Command line code:1

This problem first appeared in PHP 7.4.0.

Fixes #3965

[codecov]

Codecov Report

Merging #4486 into 8.5 will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                8.5    #4486   +/-   ##
=========================================
  Coverage     84.31%   84.31%           
  Complexity     3938     3938           
=========================================
  Files           154      154           
  Lines          9789     9789           
=========================================
  Hits           8254     8254           
  Misses         1535     1535           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e2ac24d...3bd5abb. Read the comment docs.

[sebastianbergmann]

Please make this against 8.5. Thanks!

[sanmai]

Done!