test(e2e): increase e2e workflow checkout depth to 50

this helps codecov determine the appropriate SHA when figuring out
how project coverage changed

depth of 1 (the default) is not enough for it to figure things out always,
and 0 is too heavy, 50 should be enough for any reasonable PR

c.f. ankidroid/Anki-Android#7978

Author: mikehardy

.github/workflows/tests_e2e.yml

@@ -38,7 +38,7 @@ jobs:
 
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 1
+          fetch-depth: 50
 
       - uses: actions/setup-node@v2-beta
 
@@ -213,7 +213,7 @@ jobs:
 
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 1
+          fetch-depth: 50
 
       - uses: actions/setup-node@v2-beta
 

.github/workflows/tests_jest.yml

@@ -31,7 +31,7 @@ jobs:
           access_token: ${{ github.token }}
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 1
+          fetch-depth: 50
       - uses: actions/setup-node@v2-beta
         with:
           node-version: 12