ci: Add concurrency to top-level workflows

[larseggert]

So that a failure stops all CI for a PR.

[github-actions]

QUIC Interop Runner

Saving logs to logs.
Run took 0:03:32.939983
Server: neqo-latest. Client: neqo-latest. Running test case: handshake
Server: quic-go. Client: neqo-latest. Running test case: handshake
Server: ngtcp2. Client: neqo-latest. Running test case: handshake
Server: neqo. Client: neqo-latest. Running test case: handshake
Server: msquic. Client: neqo-latest. Running test case: handshake
Server: neqo-latest. Client: quic-go. Running test case: handshake
Server: neqo-latest. Client: ngtcp2. Running test case: handshake
Server: neqo-latest. Client: neqo. Running test case: handshake
Server: neqo-latest. Client: msquic. Running test case: handshake
+-------------+-------------+---------+--------+------+--------+
|             | neqo-latest | quic-go | ngtcp2 | neqo | msquic |
+-------------+-------------+---------+--------+------+--------+
| neqo-latest |     ✓(H)    |   ✓(H)  |  ✓(H)  | ✓(H) |  ✓(H)  |
|             |     ?()     |   ?()   |  ?()   | ?()  |  ?()   |
|             |     ✕()     |   ✕()   |  ✕()   | ✕()  |  ✕()   |
+-------------+-------------+---------+--------+------+--------+
|   quic-go   |     ✓(H)    |         |        |      |        |
|             |     ?()     |         |        |      |        |
|             |     ✕()     |         |        |      |        |
+-------------+-------------+---------+--------+------+--------+
|    ngtcp2   |     ✓(H)    |         |        |      |        |
|             |     ?()     |         |        |      |        |
|             |     ✕()     |         |        |      |        |
+-------------+-------------+---------+--------+------+--------+
|     neqo    |     ✓(H)    |         |        |      |        |
|             |     ?()     |         |        |      |        |
|             |     ✕()     |         |        |      |        |
+-------------+-------------+---------+--------+------+--------+
|    msquic   |     ✓(H)    |         |        |      |        |
|             |     ?()     |         |        |      |        |
|             |     ✕()     |         |        |      |        |
+-------------+-------------+---------+--------+------+--------+

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[github-actions]

Benchmark results

• coalesce_acked_from_zero 1+1 entries
  time: [255.29 ns 255.88 ns 256.52 ns]
  change: [+1.4303% +1.8578% +2.2484%] (p = 0.00 < 0.05)
  💔 Performance has regressed.

• coalesce_acked_from_zero 3+1 entries
  time: [291.99 ns 292.64 ns 293.40 ns]
  change: [+1.5869% +1.9582% +2.3270%] (p = 0.00 < 0.05)
  💔 Performance has regressed.

• coalesce_acked_from_zero 10+1 entries
  time: [291.38 ns 295.59 ns 303.67 ns]
  change: [+1.2939% +2.7757% +5.9409%] (p = 0.00 < 0.05)
  💔 Performance has regressed.

• coalesce_acked_from_zero 1000+1 entries
  time: [267.41 ns 267.58 ns 267.79 ns]
  change: [+2.8109% +3.5634% +4.3561%] (p = 0.00 < 0.05)
  💔 Performance has regressed.

• RxStreamOrderer::inbound_frame()
  time: [125.66 ms 125.82 ms 126.07 ms]
  change: [+2.9658% +3.1081% +3.3089%] (p = 0.00 < 0.05)
  💔 Performance has regressed.

• Run multiple transfers with varying seeds
  time: [187.41 ms 188.08 ms 188.73 ms]
  change: [-7.1184% -6.6846% -6.2282%] (p = 0.00 < 0.05)
  💚 Performance has improved.

• Run multiple transfers with the same seed
  time: [189.57 ms 189.88 ms 190.20 ms]
  change: [-5.2690% -5.0327% -4.7975%] (p = 0.00 < 0.05)
  💚 Performance has improved.

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