Merge 'long fuzz tests ci on btree changes' from Pere Diaz Bou

The idea is simple, if you modify the btree, we should verify fuzz tests
with long number of iterations to decrease the chance of a regression

Closes #1502

.github/workflows/long_fuzz_tests_btree.yml

@@ -0,0 +1,30 @@
+name: Run long fuzz tests on Btree
+
+on:
+  push:
+    paths:
+      - 'core/storage/btree.rs'
+  pull_request:
+    paths:
+      - 'core/storage/btree.rs'
+
+jobs:
+  run-long-tests:
+    runs-on: ubuntu-latest
+    timeout-minutes: 0 
+    
+    steps:
+    - uses: actions/checkout@v3
+    - uses: Swatinem/rust-cache@v2
+      with:
+        prefix-key: "v1-rust" # can be updated if we need to reset caches due to non-trivial change in the dependencies (for example, custom env var were set for single workspace project)
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10"
+    - name: Build
+      run: cargo build --verbose
+    - name: Run ignored long tests
+      run: cargo test -- --ignored fuzz_long
+      env:
+        RUST_BACKTRACE: 1