Clear packets on hermes start

[ancazamfir]

Closes: #1200
Partially closes: #1196

Description

Hermes does not clear packets on start if there are no IBC events and no clear_packets_interval trigger.
The e2e script masks this error because it sends some packets, starts hermes and then sends more packets (issue masked here because this triggers packet clearing) before checking that all packets are cleared.

• Fixed script to catch the bug
• Fixed the bug

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For contributor use:

• Updated the Unreleased section of CHANGELOG.md with the issue.
• If applicable: Unit tests written, added test to CI.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments.
• Re-reviewed Files changed in the Github PR explorer.

[romac]

How about we keep the clear_packets name for the method that does the clearing, and rename this to:

Suggested change

	pub fn clear_packets(&self) -> bool {
	pub fn will_clear_packets(&self) -> bool {

or

Suggested change

	pub fn clear_packets(&self) -> bool {
	pub fn packet_clearing_enabled(&self) -> bool {

Suggesting this because I find the clear_packets and do_clear_packets naming scheme a bit confusing, as I would expect either of those to actually clear the packets.