[deleted] Hey there, happy holidays to you as well! ^_^
[deleted] First, I would like to know if very frequent flashing harms the device?
Not particularly. It's not realistically going to matter.
[deleted] After installing GrapheneOS, I found several Google apps on my device, including this one:
com.google.android.euiccoverlay
com.google.android.iwlan
com.google.euiccpixel.auto_generated_rro_product_adevtool
com.google.euiccpixel.permissions
3 of these, except com.google.android.iwlan look like the eSIM activation apps that GrapheneOS includes to allow users to activate their eSIMs in GrapheneOS.
Do note that unlike other operating systems, these apps in GrapheneOS are disabled by default, because they're are privileged.
They are only activated if you install Sandboxed Google Play on the owner profile and enable the Privileged eSIM activation toggle. They are not enabled at any other point. The eSIM activation toggle is also disabled the moment you reboot the device and stays disabled, as it's only needed for the activation portion.
com.google.android.iwlan is a standard AOSP app. AOSP is made by Google, so although that app ID might seem confusing to you, it's completely expected.
You can find it referenced here, for example:
https://android.googlesource.com/platform/packages/services/Iwlan/+/d4d186c95cb936a0fe0ac3d5ccc0484ba096b1e0
I hope that answers your questions!