feat: add e2e deployment tests for L2s

[tmigone]

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This PR adds task changes and e2e deployment tests for L1/L2. This allows us to validate steps 1.1 through 1.12 with tests (except 1.9 & 1.10 which are pending GRE support for multiple layers).

Changes

• Add chainId as optional parameter when initializing GRE. This gives some flexibility when choosing where to connect to.
• hh task e2e no longer runs scenarios, they can be run separately if needed with e2e:scenario.
• hh task migrate:unpause will unpause the bridge as well as the protocol.
• Fix bug where migrate:ownership would fail if run on L2.
• Add L2 e2e deployment tests
• Add bridge (L1 & L2) e2e tests

[codecov[bot]]

Codecov Report

Merging #676 (b8ea9e6) into l2-testnet (19de7a2) will not change coverage. The diff coverage is n/a.

@@             Coverage Diff             @@
##           l2-testnet     #676   +/-   ##
===========================================
  Coverage       92.13%   92.13%           
===========================================
  Files              44       44           
  Lines            2137     2137           
  Branches          370      370           
===========================================
  Hits             1969     1969           
  Misses            168      168           

Flag	Coverage Δ
unittests	92.13% <ø> (ø)

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[tmigone]

https://github.com/graphprotocol/contracts/pull/704 cherry picks commits from here into pcv/l2-bridge. Follow up PR will get the reservoir changes into the drip-rewards branch