Pre release v2.8.0-rc.15

What’s Changed

• chore(release-pkg): release packages (#1464) @ConfluxBot
• Fix/error handle (#1463) @mosshqq
• chore(release-pkg): release packages (#1462) @ConfluxBot
• fix: test case (#1461) @mosshqq
• fix: error handle (#1460) @mosshqq
• chore(release-pkg): release packages (#1459) @ConfluxBot
• fix: when call a contract with a valid "value" parameter should display in confirm page (#1458) @AngeliaQ
• ci(mergify): upgrade configuration to current format (#1439) @mergify
• chore(release-pkg): release packages (#1457) @ConfluxBot
• chore: add estimatedBaseFee to gasInfo (#1456) @iosh
• chore(release-pkg): release packages (#1455) @ConfluxBot
• fix: add 1559 tx speedup/cancelation (#1452) @AngeliaQ
• chore(release-pkg): release packages (#1454) @ConfluxBot
• fix: check group before insert account (#1453) @mosshqq
• chore(release-pkg): release packages (#1451) @ConfluxBot
• Fix/wallet request permissions (#1450) @mosshqq