ci: add timeout for jobs (#618)

## fixes KILTprotocol/ticket#3254
The default 1hr timeout period is no longer enough at the moment for
tests. Temporarily extending timeout until tests are optimized
## Metadata Diff to Develop Branch

<details>
<summary>Peregrine Diff</summary>

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</details>

<details>
<summary>Spiritnet Diff</summary>

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## Checklist:

- [ ] I have verified that the code works
- [ ] No panics! (checked arithmetic ops, no indexing `array[3]` use
`get(3)`, ...)
- [ ] I have verified that the code is easy to understand
  - [ ] If not, I have left a well-balanced amount of inline comments
- [ ] I have [left the code in a better
state](https://deviq.com/principles/boy-scout-rule)
- [ ] I have documented the changes (where applicable)
* Either PR or Ticket to update [the
Docs](https://github.com/KILTprotocol/docs)
    * Link the PR/Ticket here

Author: ggera

.gitlab-ci.yml

@@ -3,6 +3,7 @@ stages:
   - build
 
 clippy-and-docs:
+  timeout: 2 hours
   image: paritytech/ci-unified:bullseye-1.70.0
   stage: test
   script:
@@ -16,12 +17,14 @@ fmt:
     - cargo fmt -- --check
 
 test:
+  timeout: 2 hours
   image: paritytech/ci-unified:bullseye-1.70.0
   stage: test
   script:
     - cargo test --all --all-targets --locked
 
 test-features:
+  timeout: 2 hours
   image: paritytech/ci-unified:bullseye-1.70.0
   stage: test
   script: