Copy old bootstrap buffer data for use during migration

[briandowns]

Proposed Changes

Copy old bootstrap buffer data for use during migration.

Types of Changes

Verification

Linked Issues

#4208

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

Merging #4215 (3aa30a4) into master (623f579) will increase coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4215      +/-   ##
==========================================
+ Coverage   11.47%   11.55%   +0.08%     
==========================================
  Files         135      135              
  Lines        9240     9268      +28     
==========================================
+ Hits         1060     1071      +11     
- Misses       7954     7969      +15     
- Partials      226      228       +2     

Flag	Coverage Δ
inttests	0.66% <0.00%> (-0.01%)	⬇️
unittests	11.21% <0.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/bootstrap.go	0.00% <0.00%> (ø)
pkg/cluster/storage.go	0.00% <ø> (ø)
pkg/daemons/executor/executor.go	27.77% <0.00%> (-1.64%)	⬇️
pkg/daemons/executor/embed.go	1.40% <0.00%> (-0.03%)	⬇️
pkg/agent/run.go	0.00% <0.00%> (ø)
pkg/server/router.go	0.00% <0.00%> (ø)
pkg/cli/cmds/agent.go	0.00% <0.00%> (ø)
pkg/cli/server/server.go	0.00% <0.00%> (ø)
pkg/agent/tunnel/tunnel.go	0.00% <0.00%> (ø)
pkg/daemons/config/types.go	50.00% <0.00%> (ø)
... and 4 more

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