fix(e2e): align upgrade test script defaults with release/1.3.x

The three upgrade test scripts defaulted to OLD_VERSION=v1.2.0 and
UPGRADE_NAME=v2.0.0 (correct for main, where #221 registered the
v2.0.0 handler). On release/1.3.x there is no v2.0.0 handler, so
running e.g. `make e2e-fw-test TEST=upgrade_governance` locally without
overrides hit:

  UPGRADE "v2.0.0" NEEDED at height: 49
  panic: runtime error: invalid memory address or nil pointer dereference

Aligns the local script defaults with the CI workflow defaults set in
a5634ae / 18c3477:

  e2e/kind/tests/test_upgrade_hardfork.sh
  e2e/kind/tests/test_upgrade_governance.sh
  e2e/kind/tests/test_upgrade_comprehensive.sh
    OLD_VERSION  v1.2.0 -> v1.2.1
    UPGRADE_NAME v2.0.0 -> v1.3.0
    (also the example commands in the usage headers)

So `make e2e-fw-test TEST=upgrade_governance` on release/1.3.x now
exercises the same v1.2.1 -> v1.3.0 path as the CI workflow's default
dispatch.

Resolves phenix3443's review point 2 on #255.

Author: puneet2019

e2e/kind/tests/test_upgrade_comprehensive.sh

@@ -9,7 +9,7 @@
 # then runs all verify functions.
 #
 # Usage:
-#   OLD_VERSION=v1.2.0 bash tests/test_upgrade_comprehensive.sh
+#   OLD_VERSION=v1.2.1 bash tests/test_upgrade_comprehensive.sh
 #   UPGRADE_MODE=hardfork OLD_VERSION=main bash tests/test_upgrade_comprehensive.sh
 #   TX_ROUNDS=5 bash tests/test_upgrade_comprehensive.sh  # 5 rounds of all txs
 #
@@ -21,8 +21,8 @@
 source "$(dirname "$0")/../framework/framework.sh"
 fw_init
 
-OLD_VERSION="${OLD_VERSION:-v1.2.0}"
-UPGRADE_NAME="${UPGRADE_NAME:-v2.0.0}"
+OLD_VERSION="${OLD_VERSION:-v1.2.1}"
+UPGRADE_NAME="${UPGRADE_NAME:-v1.3.0}"
 UPGRADE_MODE="${UPGRADE_MODE:-governance}"
 TX_ROUNDS="${TX_ROUNDS:-3}"
 RELEASE_TAG="${RELEASE_TAG:-}"

e2e/kind/tests/test_upgrade_governance.sh

@@ -7,13 +7,13 @@
 # release tag (e.g., v1.1.2) — not main or the current version.
 #
 # Usage:
-#   OLD_VERSION=v1.2.0 bash tests/test_upgrade_governance.sh
+#   OLD_VERSION=v1.2.1 bash tests/test_upgrade_governance.sh
 
 source "$(dirname "$0")/../framework/framework.sh"
 fw_init
 
-OLD_VERSION="${OLD_VERSION:-v1.2.0}"
-UPGRADE_NAME="${UPGRADE_NAME:-v2.0.0}"
+OLD_VERSION="${OLD_VERSION:-v1.2.1}"
+UPGRADE_NAME="${UPGRADE_NAME:-v1.3.0}"
 FEES="200000000000000amoca"
 
 # ── Setup: deploy old version ────────────────────────────────────────────────

e2e/kind/tests/test_upgrade_hardfork.sh

@@ -3,14 +3,14 @@
 # and validates that state is preserved and the chain continues.
 #
 # Usage:
-#   OLD_VERSION=v1.2.0 bash tests/test_upgrade_hardfork.sh
+#   OLD_VERSION=v1.2.1 bash tests/test_upgrade_hardfork.sh
 #   OLD_VERSION=main   bash tests/test_upgrade_hardfork.sh
 
 source "$(dirname "$0")/../framework/framework.sh"
 fw_init
 
-OLD_VERSION="${OLD_VERSION:-v1.2.0}"
-UPGRADE_NAME="${UPGRADE_NAME:-v2.0.0}"
+OLD_VERSION="${OLD_VERSION:-v1.2.1}"
+UPGRADE_NAME="${UPGRADE_NAME:-v1.3.0}"
 FEES="200000000000000amoca"
 
 # ── Setup: deploy old version ────────────────────────────────────────────────