tests: internal: event_loop: increase eplison on linux to account for noisy neighbours. (#8246)

Increase the epsilon for timed tests on linux to account for
noisy neighbours and other factors when running tests.

Without this increase the event_loop tests is prone to random
failures, especially when the same machine is being used for
other tasks.

Signed-off-by: Phillip Whelan <[email protected]>

Author: pwhelan

tests/internal/flb_event_loop.c

@@ -23,7 +23,7 @@
 #elif FLB_SYSTEM_MACOS
     #define TIME_EPSILON_MS 200
 #else
-    #define TIME_EPSILON_MS 10
+    #define TIME_EPSILON_MS 50
 #endif
 
 #define TIMER_COARSE_EPSION_MS 300